JP5097685B2 - Image processing apparatus and image processing program - Google Patents

Description

  The present invention relates to an image processing apparatus and an image processing program.

  In a certain gradation drawing processing method, a line image in the vertical direction or the horizontal direction is generated, the line image is copied in the horizontal direction or the vertical direction, and the gradation is drawn in the target area (see, for example, Patent Document 1).

In addition, in a certain gradation pattern generation method, when the gradation direction is not parallel to the scanning line direction, areas of the same color that are perpendicular to the straight line connecting the start point and the end point of the gradation are set as the band areas. A gradation pattern in the scanning line direction is generated using the intersection of the two as a color change point (see, for example, Patent Document 2).
JP 2001-101431 A Japanese Patent Laid-Open No. 11-25282

  In the above-described method, a line pattern or the like is uniformly expanded to generate a gradation pattern in the target area. For this reason, even when the transmittance is set for only a part of the gradation, the transmittance data is assigned to all the pixels. In other words, transmittance data with a transmittance of zero is attached to pixels for which the transmittance is not set in the line image, and the blending process is executed for all the pixels at the time of drawing.

  Therefore, the data capacity required for the transmittance data is increased, and the time required for the drawing process is increased by the blending process.

  An object of the present invention is to obtain an image processing apparatus and an image processing program capable of reducing the data capacity required for gradation drawing processing and executing the gradation drawing processing at high speed.

  In order to solve the above problems, the present invention is configured as follows.

An image processing apparatus according to the present invention includes: a receiving unit that receives a gradation drawing command; a line image generating unit that generates a gradation line image in the gradation direction of the color value of the gradation drawing command; and the gradation line image that is perpendicular to the gradation direction. And an image processing means for drawing in an area designated by a gradation drawing command. The line image generation means, when the transmittance is set for only a part of the gradation in the gradation drawing command, the first gradation line image in the interval where the transmittance is set as the gradation line image, and the transmission The second gradation line image of the remaining section where the rate is not set is created, and the image processing means separates the first gradation line image and the second gradation line image, and expands and draws each. Do.

  As a result, in the gradation drawing target area, the area for which the transmittance is set and the area for which the transmittance is not set are separated and processed, so that the data capacity required for the gradation drawing process is reduced. The gradation drawing process can be executed at high speed.

  In addition to the image processing apparatus described above, the image processing apparatus according to the present invention may be configured as follows. In this case, the data of the first gradation line image has transmittance data, and the data of the second gradation line image does not have transmittance data.

  As a result, the transmittance data is not attached to the region where the transmittance is not set, so that the data capacity required for the gradation drawing process can be reduced.

  The image processing apparatus according to the present invention may be as follows in addition to any of the image processing apparatuses described above. In this case, the image processing means performs a blend process when expanding the first gradation line image, and performs an overwrite drawing process when expanding the second gradation line image.

  Thereby, since the blending process is not performed for the area where the transmittance is not set, the time required for the gradation drawing process can be shortened.

  The image processing apparatus according to the present invention may be as follows in addition to any of the image processing apparatuses described above. In this case, the image processing means collectively extends the first gradation line image and collectively extends the second gradation line image.

  The image processing apparatus according to the present invention may be as follows in addition to any of the image processing apparatuses described above. In this case, the image processing apparatus determines that the drawing method to be used for the gradation drawing command is the drawing processing based on the gradation line image when the color change in the drawing direction is large when gradation by the gradation drawing command is applied. If it is determined that the drawing method to be used for the gradation drawing command is fill processing, and the drawing method to be used for the gradation drawing command is determined to be fill processing. And fill processing means for executing fill processing of each color of the gradation on the area designated by the gradation drawing command. The line image generation means generates a gradation line image in the gradation direction of the gradation drawing command when the drawing method to be used for the gradation drawing command is determined to be drawing processing by the gradation line image, and performs image processing. When it is determined that the drawing method to be used for the gradation drawing command is the drawing process using the gradation line image, the means performs drawing by extending the gradation line image in a direction perpendicular to the gradation direction.

  Thereby, when there is little change in color in the drawing direction, the drawing process is performed at high speed by the fill process.

  The image processing apparatus according to the present invention may be as follows in addition to any of the image processing apparatuses described above. In this case, the determination means determines whether the color change in the drawing direction is large when gradation is applied by the gradation drawing command based on the gradation direction specified by the gradation drawing command and the color values at the start and end points. Determine.

  The greater the difference between the color value at the start point and the color value at the end point, more specifically, the greater the color difference between the specified points of the adjacent gradation colors, the closer the distance, the greater the change in color in the drawing direction. Thus, the closer the gradation direction is to the drawing direction, the greater the color change in the drawing direction. Therefore, the degree of color change in the drawing direction can be specified by considering the color values of the start point and end point specified by the gradation drawing command and the gradation direction.

  The image processing apparatus according to the present invention may be as follows in addition to any of the image processing apparatuses described above. In this case, for each pixel to be drawn, the image processing means specifies the color value of the projection point on the gradation line image for that pixel as the color value of that pixel.

  The image processing apparatus according to the present invention may be as follows in addition to any of the image processing apparatuses described above. In this case, the line image generation means extrapolates the gradation line image by extrapolating from the start point and / or end point when the start point and / or end point of the gradation specified by the gradation drawing command is inside the drawing area. Generate.

An image processing program according to the present invention includes a computer for receiving a gradation drawing command, a line image generating unit for generating a gradation line image in the gradation direction of the color value of the gradation drawing command, and a gradation line image. The image processing means functions as an image processing means for performing drawing on an area designated by a gradation drawing command. The line image generation means, when the transmittance is set for only a part of the gradation in the gradation drawing command, the first gradation line image in the interval where the transmittance is set as the gradation line image, and the transmission The second gradation line image of the remaining section where the rate is not set is created, and the image processing means separates the first gradation line image and the second gradation line image, and expands and draws each. Do.

  As a result, in the gradation drawing target area, the area for which the transmittance is set and the area for which the transmittance is not set are separated and processed, so that the data capacity required for the gradation drawing process is reduced. The gradation drawing process can be executed at high speed.

  In addition to the above-described image processing program, the image processing program according to the present invention may be as follows. If the computer further applies a gradation by the gradation drawing command and the color change in the drawing direction is large, it is determined that the drawing method to be used for the gradation drawing command is the drawing process by the gradation line image, Otherwise, the determination means for determining that the drawing method to be used for the gradation drawing command is fill processing, and the gradation drawing when the drawing method to be used for the gradation drawing command is determined to be fill processing. The area designated by the command is made to function as a fill processing means for executing fill processing of each color of gradation. The line image generation means generates a gradation line image in the gradation direction of the gradation drawing command when the drawing method to be used for the gradation drawing command is determined to be drawing processing by the gradation line image, and performs image processing. When it is determined that the drawing method to be used for the gradation drawing command is the drawing process using the gradation line image, the means performs drawing by extending the gradation line image in a direction perpendicular to the gradation direction.

  Thereby, when there is little change in color in the drawing direction, the drawing process is performed at high speed by the fill process.

  According to the present invention, it is possible to obtain an image processing apparatus and an image processing program capable of reducing the data volume required for gradation drawing processing and executing the gradation drawing processing at high speed.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

  FIG. 1 is a block diagram showing a configuration of an image processing apparatus according to an embodiment of the present invention.

  In FIG. 1, an arithmetic processing unit 1 is a computer that executes processing according to a program. The data storage device 2 is a device having a recording medium on which programs, data, and the like are recorded. The data storage device 2 stores an image processing program 21. As described above, a portable recording medium such as a flash memory, a hard disk drive, and a compact disk, and a drive device thereof are used as the device. The communication interface 3 is a device that performs data communication with other devices. As the communication interface 3, a peripheral device interface, a network interface, or the like is used. The output device 4 is a device that outputs an image, such as a printer or a display.

  The arithmetic processing unit 1 includes a CPU (Central Processing Unit) 11, a ROM (Read Only Memory) 12, a RAM (Random Access Memory) 13, a VRAM (Video RAM) 14, and a data communication with each other via a bus or a controller. Interfaces 15 to 17 are provided.

  The CPU 11 is an arithmetic processing unit that loads a program stored in the data storage device 2 or the ROM 12 to the RAM 13 and executes the program, and executes processing described in the program. The ROM 12 is a nonvolatile memory that stores programs and data in advance. The RAM 13 is a memory that temporarily stores the program and data when the program is executed.

  The VRAM 14 is a memory that stores the color value of each pixel in the drawing area corresponding to the output device 4.

  The interface 15 is an interface circuit to which the data storage device 2 can be connected. The interface 16 is an interface circuit to which the communication interface 3 can be connected. The interface 17 is an interface circuit to which the output device 4 can be connected.

  When the image processing program 21 is executed by the arithmetic processing device 1, various processing units are realized. FIG. 2 is a block diagram showing a configuration of a processing unit realized by the image processing program 21 in the apparatus of FIG.

  In FIG. 2, a data receiving unit 31 is a processing unit that performs data communication with a device such as a host computer via the communication interface 3.

  The data analysis unit 32 is a processing unit that analyzes received data and extracts drawing commands and the like.

  The drawing data processing unit 33 is a processing unit that causes the drawing unit 34 to execute a drawing process corresponding to the drawing command extracted by the data analysis unit 32. The drawing data processing unit 33 includes a drawing environment management unit 41, an image processing unit 42, a vector processing unit 43, a character processing unit 44, a clip processing unit 45, and a display list creation unit 46.

  The drawing environment management unit 41 is a processing unit that manages setting information. The setting information includes a conversion matrix for enlargement / reduction, information on a currently valid screen, and the like.

  The vector processing unit 43 is a processing unit that executes a drawing process based on vector data. FIG. 3 is a block diagram showing the configuration of the vector processing unit 43 in FIG. The vector processing unit 43 includes a gradation processing method determination unit 51, a gradation image creation unit 52, and a fill processing unit 53.

  The gradation processing method determination unit 51 is a processing unit that determines whether a drawing method to be used for a gradation drawing command is a drawing process using a gradation line image or a fill process when the drawing command is a gradation drawing command. The gradation processing method determination unit 51 determines that the drawing method to be used for the gradation drawing command is the drawing processing based on the gradation line image when the color change in the drawing direction is large when the gradation by the gradation drawing command is applied. If not, it is determined that the drawing method to be used for the gradation drawing command is fill processing. Based on the gradation direction specified by the gradation drawing command and the color values at the start point and the end point, the gradation processing method determination unit 51 determines whether the color change in the drawing direction is large when gradation is applied by the gradation drawing command. Determine whether.

  The gradation image creation unit 52 is a processing unit that generates a gradation line image in the gradation direction of the gradation drawing command. The gradation image creating unit 52 generates a gradation line image when it is determined that the drawing method to be used for the gradation drawing command is the drawing process using the gradation line image.

  When it is determined that the drawing method to be used for the gradation drawing command is the fill processing, the fill processing unit 53 executes the fill processing of each color of the gradation on the area specified by the gradation drawing command. It is. In the fill process, an area is specified by a path, and the area is filled with one color.

  Returning to FIG. 2, the image processing unit 42 is a processing unit that executes drawing processing of image data. The image processing unit 42 is a processing unit that expands the gradation line image in a direction perpendicular to the gradation direction and performs drawing on the region designated by the gradation drawing command. When it is determined that the drawing method to be used for the gradation drawing command is the drawing process using the gradation line image, the image processing unit 42 uses the gradation line image created by the gradation line image creating unit 52 for the designated path. Draw with.

  The character processing unit 44 in the drawing data processing unit 33 is a processing unit that executes drawing processing of character data. The clip processing unit 45 is a processing unit that performs clip processing. The display list creation unit 46 is a processing unit that generates a display list based on the processing results of the image processing unit 42, the vector processing unit 43, the character processing unit 44, and the clip processing unit 45.

  The drawing unit 34 is a processing unit that writes a bitmap based on the display list generated by the processing unit 46 of the drawing data processing unit 33 to the VRAM 14.

  The memory management unit 35 is a processing unit that manages the memory in the arithmetic processing device 1. The system control unit 36 is a processing unit that controls each unit in the arithmetic processing device 1.

  Here, the gradation drawing process will be described.

  In the gradation drawing command, the start point and end point of the gradation are specified, and further, the color value of the start point and the color value of the end point are specified. The start point and the end point are each specified by coordinate values. Thereby, the direction from the start point to the end point becomes the gradation direction. Then, the straight line passing through the start point and the end point is divided into a plurality of sections, and the color value of each section is calculated based on the color value of the start point and the color value of the end point, the start point and / or the end point to the section, The same color is designated for the area extending vertically from each section.

  In the gradation drawing command, the transmittance can be set for all or only a part of the section from the start point to the end point. Therefore, the gradation pattern can be blended with other images.

  FIG. 4 is a diagram illustrating an example of a drawn image. FIG. 5 is a diagram illustrating an example of a gradation pattern. FIG. 6 is a diagram showing an image obtained by blending the image shown in FIG. 4 and the gradation pattern shown in FIG. 5 with a constant transmittance. For example, the image shown in FIG. 4 and the gradation pattern shown in FIG. 5 can be blended with a constant transmittance as shown in FIG.

  Further, when the transmittance is set for only a part of the gradation, the image shown in FIG. 4 is seen through only in the region where the transmittance is set. FIG. 7 is a diagram showing an image obtained by superimposing the image shown in FIG. 4 and the gradation pattern in which the transmittance is set only on a part thereof.

  In this apparatus, a drawing area for one page is divided into a plurality of bands, and a drawing process is executed for each band. FIG. 8 is a diagram illustrating an example of a band obtained by dividing a drawing area for one page. As shown in FIG. 8, the drawing area is divided in the direction perpendicular to the drawing direction so that the drawing direction (the continuous direction of the drawing pixels) is the long side of the band.

  Next, the operation of the above apparatus will be described. FIG. 9 is a flowchart for explaining the operation of the apparatus shown in FIG.

  Data including a gradation drawing command is received by the data receiving unit 31, and the gradation drawing command is supplied from the data analysis unit 32 to the drawing data processing unit 33 (step S1).

  The gradation drawing command is assigned to the vector processing unit 43 of the drawing data processing unit 33. The gradation processing method determination unit 51 of the vector processing unit 43 determines whether the drawing processing specified by the gradation drawing command is performed by the fill processing unit 53 or the gradation image creation unit 52 and the image processing unit 42 ( Step S2).

  At this time, the determination unit 51 determines whether or not the color change in the band direction is large. When the color change in the band direction is large, the determination unit 51 determines that the drawing processing is performed by the gradation image creation unit 52 and the image processing unit 42, and otherwise, the drawing processing is performed by the fill processing unit 53. Determine to do.

  For example, the determination unit 51 determines whether or not the color change in the drawing direction is large when the gradation according to the gradation drawing command is applied based on the gradation direction specified by the gradation drawing command and the color values at the start and end points. Determine.

  When it is determined that the color change in the band direction is large, the gradation image creating unit 52 generates a gradation line image based on the gradation drawing command (step S3). The gradation line image is image data having a width of 1 pixel along a straight line passing through the start point and the end point specified by the gradation drawing command. When the start point and / or the end point are located inside the predetermined drawing area, the gradation line image is generated by extrapolating all the drawing areas that can be covered when extending in the vertical direction. For example, the color value of the extrapolated portion is the same as the color value of the adjacent start point or end point.

  When the transmittance α is set for only a part of the gradation by the gradation drawing command, the gradation image creating unit 52 uses the gradation line image (the first line) of the section where the transmittance is set based on the gradation drawing command. (Gradation line image) and a gradation line image (second gradation line image) in a section where the transmittance is not set are generated. At this time, the transmittance data is included in the data of the first gradation line image, but the transmittance data is not included in the data of the second gradation line image. FIG. 10 is a diagram illustrating an example of a gradation line image in which the transmittance is set in part. The gradation pattern shown in FIG. 10A is partially opaque, and the line image shown in FIG. 10B corresponds to the gradation pattern shown in FIG. I don't have rate data.

  After the gradation line image is generated, the image processing unit 42 extends the gradation line image in the direction perpendicular to the gradation direction and draws the gradation pattern in the drawing area (step S4). In this drawing process, the image processing unit 42 sequentially calculates the color value of each pixel along the drawing direction, the display list creation unit 46 generates a display list corresponding to the color value, and the drawing unit 34 Based on the display list, the pixel value is written into the VRAM 14. The image processing unit 42 specifies the position of the projection point on the straight line passing through the start point and end point of the gradation (intersection of the vertical line from the pixel position to the straight line and the straight line) for the pixel in the target drawing area, The color value of the pixel of the gradation line image at the position is specified, and the color value is set as the color value of the pixel in the target drawing area.

  When the first and second gradation line images are generated as the gradation line image, the image processing unit 42 expands the first gradation line image in the direction perpendicular to the gradation direction, and transmits the transmittance data. Draw a gradation pattern by blending with. At this time, the image processing unit 42 calculates the color value of each pixel in order along the drawing direction for the area in which the first gradation line image is extended and drawn, and the display list creation unit 46 A display list for performing blend processing based on the value and the transmittance data is generated, and the drawing unit 34 writes pixel values to the VRAM 14 based on the display list. In this case, next, the image processing unit 42 expands the second gradation line image in the direction perpendicular to the gradation direction, and draws the gradation pattern by the overwriting process. At this time, the image processing unit 42 sequentially calculates the color value of each pixel along the drawing direction for the area in which the second gradation line image is extended and drawn, and the display list creation unit 46 The display list for performing the overwrite process based on the value is generated, and the drawing unit 34 writes the pixel value to the VRAM 14 based on the display list. In the blending process, an average value of two color values in the pixel at the same position for two images, which is weighted by the transmittance, is calculated and used as the color value after the blending process for the pixel.

  Here, how to draw each pixel in the drawing area using the gradation line image based on the gradation line image will be described.

  FIG. 11 is a diagram illustrating an example of a gradation pattern when the color change in the band direction is large. The gradation direction of the gradation pattern shown in FIG. 11 is oblique to the drawing direction (band direction). FIG. 12 is a diagram showing a gradation line image corresponding to the gradation pattern shown in FIG.

  FIG. 13 is a diagram illustrating an example of a correspondence relationship between pixels in the drawing area and pixels in the gradation line image. As shown in FIG. 13, each pixel in the drawing area corresponds to one of the pixels in the gradation line image. 14 and 15 are diagrams illustrating the order of pixels to be drawn in the drawing process using the gradation line image. As shown in FIGS. 14 and 15, the color value of each pixel is specified as described above in order along the drawing direction.

  In this way, the gradation pattern is drawn by the drawing process using the gradation line image.

  On the other hand, when it is determined that the color change in the band direction is not large, the fill processing unit 53 draws the gradation pattern by the fill processing based on the gradation drawing command (step S5). Based on the gradation drawing command, the fill processing unit 53 designates each region of the same color within the band by a pass, and causes the display list creation unit 46 to generate a display list for performing the fill processing on each region. The drawing unit 34 writes pixel values to the VRAM 14 based on the display list.

  Thus, when the drawing process in the drawing area is completed, the data in the drawing area is supplied to the output device 4 via the interface 17, and the output device 4 outputs an image based on the data.

  As described above, according to the above-described embodiment, for the gradation drawing command received by the data receiving unit 31, the gradation image creating unit 52 generates a gradation line image in the gradation direction of the gradation drawing command, and the image processing unit 42. Expands the gradation line image in a direction perpendicular to the gradation direction, and performs drawing on the area designated by the gradation drawing command. Then, when the transmittance is set for only a part of the gradation in the gradation drawing command, the gradation image creating unit 52, as the gradation line image, the first gradation line image of the section in which the transmittance is set; A second gradation line image in a section where the transmittance is not set is created.

  As a result, in the gradation drawing target area, the area for which the transmittance is set and the area for which the transmittance is not set are separated and processed, so that the data capacity required for the gradation drawing process is reduced. The gradation drawing process can be executed at high speed.

  Further, according to the above embodiment, the data of the first gradation line image has the transmittance data, and the data of the second gradation line image does not have the transmittance data.

  As a result, the transmittance data is not attached to the region where the transmittance is not set, so that the data capacity required for the gradation drawing process can be reduced.

  Further, according to the above embodiment, the image processing unit 42 performs blend processing when expanding the first gradation line image, and performs overwrite drawing processing when expanding the second gradation line image. .

  Thereby, since the blending process is not performed for the area where the transmittance is not set, the time required for the gradation drawing process can be shortened.

  Further, according to the above embodiment, when the gradation by the gradation drawing command is applied and the color change in the drawing direction is large, the determination unit 51 determines the drawing method to be used for the gradation drawing command as the gradation line image. If it is not, it is determined that the drawing method to be used for the gradation drawing command is the fill process. When it is determined that the drawing method to be used for the gradation drawing command is fill processing, the fill processing unit 53 performs fill processing of each color of gradation on the area specified by the gradation drawing command. When it is determined that the drawing method to be used for the gradation drawing command is drawing processing using a gradation line image, the gradation image creating unit 52 generates a gradation line image in the gradation direction of the gradation drawing command, and the image processing unit When it is determined that the drawing method to be used for the gradation drawing command is drawing processing using a gradation line image, the drawing is performed by extending the gradation line image in a direction perpendicular to the gradation direction.

  Thereby, when there is little change in color in the drawing direction, the drawing process is performed at high speed by the fill process.

  Further, according to the above embodiment, the determination unit 51 applies the gradation in the drawing direction when the gradation by the gradation drawing command is applied based on the gradation direction specified by the gradation drawing command and the color values at the start point and the end point. It is determined whether the color change is large. The greater the difference between the start point color value and the end point color value, the greater the color change in the drawing direction, and the closer the gradation direction is to the drawing direction, the greater the color change in the drawing direction. Therefore, the degree of color change in the drawing direction can be specified by considering the color values of the start point and end point specified by the gradation drawing command and the gradation direction.

  The above-described embodiments are preferred examples of the present invention, but the present invention is not limited to these, and various modifications and changes can be made without departing from the scope of the present invention. is there.

  For example, in the above embodiment, there may be two or more areas in which no transmittance is set in the gradation pattern.

  In the above embodiment, the image processing program 21 may be stored in the ROM 12.

  In the above embodiment, a part of the storage area of the RAM 13 may be used as the VRAM 14.

  The present invention is applicable to, for example, a printing apparatus.

It is a block diagram which shows the structure of the image processing apparatus which concerns on embodiment of this invention. FIG. 2 is a block diagram showing a configuration of a processing unit realized by an image processing program in the apparatus of FIG. 1. It is a block diagram which shows the structure of the vector process part in FIG. It is a figure which shows an example of a drawing image. It is a figure which shows an example of a gradation pattern. FIG. 6 is a diagram showing an image obtained by blending the image shown in FIG. 4 and the gradation pattern shown in FIG. 5 with a constant transmittance. It is a figure which shows the image which superimposed the image shown in FIG. 4, and the gradation pattern in which the transmittance | permeability was set only in part. It is a figure which shows an example of the band which divided | segmented the drawing area for 1 page. It is a flowchart explaining operation | movement of the apparatus of FIG. It is a figure which shows an example of the gradation line image in which the transmittance | permeability was set in part. It is a figure which shows an example of the gradation pattern in case the color change in a band direction is large. It is a figure which shows the gradation line image corresponding to the gradation pattern shown in FIG. It is a figure which shows an example of the correspondence of the pixel in a drawing area | region, and the pixel in a gradation line image. It is a figure which shows the order of the pixel drawn in the drawing process by a gradation line image. It is a figure which shows the order of the pixel drawn in the drawing process by a gradation line image.

Explanation of symbols

1. Arithmetic processing device (example of computer)
21 Image processing program 31 Data receiving section (an example of receiving means)
42 Image processing unit (an example of image processing means)
51 Gradation processing method determination unit (an example of determination means)
52 Gradation image creation unit (an example of line image generation means)
53 Fill processing unit (an example of fill processing means)

Claims (10)

In an image processing apparatus that continuously performs drawing processing along a predetermined drawing direction,
Receiving means for receiving a gradation drawing command;
Line image generation means for generating a gradation line image in the gradation direction of the color value of the gradation drawing command;
Image processing means for extending the gradation line image in a direction perpendicular to the gradation direction and performing drawing on an area designated by the gradation drawing command;
When the transmittance is set for only a part of the gradation in the gradation drawing command, the line image generation means, as the gradation line image, a first gradation line image in a section where the transmittance is set; Create the second gradation line image of the remaining section where the transmittance is not set ,
The image processing means separates the first gradation line image and the second gradation line image, respectively expands and performs the drawing ;
An image processing apparatus.   The image processing apparatus according to claim 1, wherein the first gradation line image data includes transmittance data, and the second gradation line image data does not include transmittance data.   2. The image processing unit according to claim 1, wherein blending processing is performed when the first gradation line image is expanded, and overwriting processing is performed when the second gradation line image is expanded. Alternatively, the image processing apparatus according to claim 2.   4. The image processing apparatus according to claim 3, wherein the image processing means collectively extends the first gradation line image and collectively extends the second gradation line image. When the gradation by the gradation drawing command is applied and the color change in the drawing direction is large, it is determined that the drawing method to be used for the gradation drawing command is the drawing processing by the gradation line image. Determining means for determining that the drawing method to be used for the gradation drawing command is fill processing;
Fill processing means for executing fill processing of each color of gradation on an area designated by the gradation drawing command when it is determined that the drawing method to be used for the gradation drawing command is fill processing. ,
The line image generation means generates a gradation line image in the gradation direction of the gradation drawing instruction when it is determined that a drawing method to be used for the gradation drawing instruction is drawing processing by the gradation line image;
The image processing means expands the gradation line image in a direction perpendicular to the gradation direction when it is determined that a drawing method to be used for the gradation drawing command is a drawing process using the gradation line image. Doing drawing,
The image processing apparatus according to claim 1, wherein:   The determination means determines whether or not the color change in the drawing direction is large when the gradation according to the gradation drawing command is applied based on the gradation direction specified by the gradation drawing command and the color values at the start and end points. The image processing apparatus according to claim 5, wherein:   6. The image processing according to claim 5, wherein the image processing means specifies, for each pixel to be drawn, a color value of a projection point on the gradation line image for the pixel as a color value of the pixel. apparatus.   The line image generation means extrapolates from the start point and / or end point to generate a gradation line image when the start point and / or end point of the gradation specified by the gradation drawing command is inside the drawing area. The image processing apparatus according to claim 5. In an image processing program for causing a computer to perform drawing processing continuously along a predetermined drawing direction,
The computer,
Receiving means for receiving a gradation drawing command;
Line image generation means for generating a gradation line image in the gradation direction of the color value of the gradation drawing command, and an area designated by the gradation drawing command by extending the gradation line image in a direction perpendicular to the gradation direction Function as image processing means for drawing
When the transmittance is set for only a part of the gradation in the gradation drawing command, the line image generation means, as the gradation line image, a first gradation line image in a section where the transmittance is set; Create the second gradation line image of the remaining section where the transmittance is not set ,
The image processing means separates the first gradation line image and the second gradation line image, respectively expands and performs the drawing ;
An image processing program characterized by the above. Said computer further
When the gradation by the gradation drawing command is applied and the color change in the drawing direction is large, it is determined that the drawing method to be used for the gradation drawing command is the drawing processing by the gradation line image. Determining means for determining that a drawing method to be used for the gradation drawing command is fill processing; and, if the drawing method to be used for the gradation drawing command is determined to be fill processing, the gradation drawing For the area specified by the command, it functions as a fill processing means for executing fill processing for each color of gradation,
The line image generation means generates a gradation line image in the gradation direction of the gradation drawing instruction when it is determined that a drawing method to be used for the gradation drawing instruction is drawing processing by the gradation line image;
The image processing means expands the gradation line image in a direction perpendicular to the gradation direction when it is determined that a drawing method to be used for the gradation drawing command is a drawing process using the gradation line image. Doing drawing,
The image processing program according to claim 9.