KR102017290B1 - Apparatus for changing color and operating method thereof - Google Patents

Abstract

According to the present invention, an apparatus for transforming a color and an operation method thereof may process color transformation of a digital image with high speed without transforming a color of a digital image into a LAB value by selecting a color range corresponding to a type of a color transforming instruction of the N number of color ranges and changing a color range value of a color range selected based on the color transforming instruction when the color transforming instruction is inputted.

Description

Color converting device and its operation method {APPARATUS FOR CHANGING COLOR AND OPERATING METHOD THEREOF}

The present invention relates to a color conversion apparatus and its operation method.

Recently, various devices generate or output color digital images. However, all of these devices have a problem of outputting different colors depending on the device even when generating or outputting a digital image of the same color due to the device characteristics. As the problem is solved and the demand for accurate colors is increased, a color engine for using accurate colors has been developed and used.

A typical color engine converts the color of an image to its original color using a three-dimensional LAB (CIE LAB color space) that can distinguish more than 1.6 billion colors. The color engine using the LAB converts the color of the digital image into the LAB value using the ICC profile, converts it to the color value to be used, and processes the color conversion by mapping the color space.

In this process, a complex computation task such as three-dimensional mapping is required, which takes a long time for color conversion of a digital image, and requires a high performance of the device.

Therefore, there is a need for a study of an algorithm capable of processing color conversion of a digital image at high speed.

In the color conversion apparatus and its operation method according to the present invention, when a color conversion command is input, a color range corresponding to the type of the color conversion command is selected from the N color ranges, and then the selected color is based on the color conversion change command. By changing the color range value of a range, one wants to process color conversion of a digital image at high speed without converting it to a LAB value.

According to an embodiment of the present invention, a color converting apparatus includes N in a range of color values that N color components may have, based on a color value of each of N color components, wherein N is an integer of 3 or more. A color range separating unit for dividing into four color ranges and a color conversion command is input, selecting a color range corresponding to the type of the color conversion command among the N color ranges, and then selecting the selected color range based on the color conversion changing command. And a color converting unit configured to change a color range value of the color range value converting unit, and a color converting unit converting each of the N color components of the pixel based on the N color ranges in which the color range value is changed.

In addition, the operating method of the color conversion apparatus according to an embodiment of the present invention, the color of each of the N color components, based on the color value of each of the N-N color components of the pixel-N is an integer of 3 or more Dividing the range of values into N color ranges, and when a color conversion command is input, selects a color range corresponding to the type of the color conversion command among the N color ranges, and then selects the selected color range based on the color conversion change command. Changing a color range value of a color range and converting the color range value into a color value of each of the N color components of the pixel based on the N color ranges in which the color range value has been changed.

In the color conversion apparatus and its operation method according to the present invention, when a color conversion command is input, a color range corresponding to the type of the color conversion command is selected from the N color ranges, and then the selected color is based on the color conversion change command. By changing the color range value of the range, it is possible to process the color conversion of the digital image at high speed without converting it to the LAB value.

1 is a diagram illustrating a configuration of a color conversion apparatus according to an embodiment of the present invention.
2 is a flowchart illustrating a method of operating a color conversion apparatus according to an embodiment of the present invention.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. This description is not intended to limit the invention to the specific embodiments, it should be understood to include all changes, equivalents, and substitutes included in the spirit and scope of the invention. In describing the drawings, similar reference numerals are used for similar components, and unless otherwise defined, all terms used in the present specification, including technical or scientific terms, may be used in the art to which the present invention pertains. It has the same meaning as is commonly understood by someone who has it.

1 is a diagram illustrating a configuration of a color conversion apparatus 100 according to an embodiment of the present invention.

Referring to FIG. 1, the color converting apparatus 100 according to an exemplary embodiment of the present invention may include an image storage unit 110, an image load unit 120, a user input unit 130, a color range separator 140, and a color. The range value changing unit 150 and the color converter 155 may be included.

First, the image storage unit 110 may store an image composed of a plurality of pixels. Here, each of the plurality of pixels may include information on color values of each of the N color components. Here, when the color components are represented by the RGB method, N is 3, and when the color components are represented by the CMYK method, N may be 4.

For example, when N is 3, the image storage unit 110 may store an image composed of a plurality of pixels as shown in Table 1 below.

image pixel Color composition R G B Image 1 Pixel 1 192 128 64 Pixel 2 192 96 96 Pixel 3 192 96 0 Pixel 4 192 0 0 ... ... ... ... ...

Here, as shown in Table 1, the color value of each color component of each pixel of the image 1 may have a value between 0 and 255 when expressed in 8 bits. Next, the image load unit 120 loads the image selected through the user input unit 130 from the image storage unit 110 and transfers the image to the display unit 125, the image is transmitted by the display unit 125 Can be displayed.

Next, the color range separator 140 may generate color values of the N color components based on the color values of each of the color components of the pixels included in the image loaded by the image loader 120. The range of can be divided into N color ranges. Here, the range of the color value may be 0 to 255 when the color value of each of the color components of each pixel is represented by 8 bits.

Here, each of the N color range is 2 ^N -1 different colors may indicate a single color channel of the channel, 2 ^N -1 different color channels may exhibit a color according to combination of said N color components. For example, if N is 3 (that is, for RGB color), there are R color channels, G color channels, B color channels, RG color channels, RB color channels, GB color channels, and RGB color channels. Color range represents one color channel of the R color channel, the G color channel, and the B color channel, and the second color range represents the color channel of one of the RG color channel, the RB color channel, and the GB color channel. The second color range may represent an RGB color channel. That is, the first color range represents a color channel according to a color including one color component, the second color range represents a color channel according to a color including two color components, and the third color range represents three colors. It may represent a color channel according to the color including the component. In this case, the value of the color channel according to the color including one or two color components may represent saturation, and the value of the color channel according to the color including three color components may be interpreted to represent brightness. On the other hand, when N is 4 (that is, in the case of CMYK color), the value of the color channel according to the color including one to three color components indicates saturation, and the value of the color channel according to the color including four color components The value can be interpreted as representing brightness.

Specifically, the color range separator 140 determines an i-th highest color value of the color values of the N color components of an arbitrary pixel as an upper limit value of the i-th color range, and colors the colors of the N color components of the arbitrary pixel. By determining the i + 1 th highest color value among the values as the lower limit value of the i th color range, the range of color values that the N color components may have may be divided into N color ranges. Here, i is an integer of 1 or more and N or less, and when i is N, the lower limit of the Nth color range may be determined as 0.

For example, when image 1 is loaded, the color range separator 140 sets a range of color values that three color components of pixels 1 to 4 of the image 1 may have as shown in Table 2 below. Can be divided into

pixel First color range Second color range 3rd color range Upper limit Lower limit Upper limit Lower limit Upper limit Lower limit Pixel 1 192 128 128 64 64 0 Pixel 2 192 96 96 96 96 0 Pixel 3 192 96 96 0 0 0 Pixel 4 192 0 0 0 0 0

Here, the first color range of pixels 1 to 4 represents an R color channel, the second color range of pixels 1 and 3 represents an RG color channel, and the third color range of pixels 1 and 2 represents an RGB color channel. Can be. On the other hand, the second color range of pixels 2 and 4 with color range 0 and the third color range of pixels 3 and 4 do not represent a color channel, and as the range of color channels is increased, The two color ranges may represent an RG color channel or an RB color channel, and the third color range of pixels 3 and 4 may represent an RGB color channel. Next, when a color conversion command is input through the user input unit 130, the color range value changing unit 150 selects a color range corresponding to the type of the color conversion command from the N color ranges, and then changes the color conversion. The color range value of the selected color range may be changed based on the command. Thereafter, the color range value changing unit 150 may transmit the N th color range in which the color range value is changed to the color conversion unit 155. Here, the color conversion unit 155 converts the color values of the N color components of the arbitrary pixel based on the changed Nth color range to the display unit 125 by transmitting them to the display unit 125. The image whose color value is changed by the color conversion command may be displayed on the display 125. Here, the type of the color conversion command may be divided into a first chroma value change command, a second chroma value change command, and a brightness value change command, and the first chroma value change command may include the first chroma value change command. The saturation value changing command when the number of color components included in the target color is one, and the second saturation value changing command includes two or more number of color components included in the target color of the second saturation value changing command. Command to change saturation value when less than.

Specifically, when the type of the color conversion command is the first saturation value changing command, the color range value changing unit 150 includes all one color component included in the target color among the N color ranges. You can select the highest color range from the color range that represents the color channels by color. Here, the color range representing the color channel according to the color including the smaller number of color components may be determined to be a higher color range than the color range representing the color channel according to the color including the greater number of color components. Here, an upper limit value of the i th color range may be equal to an i th highest color value among the color values of the N color components.

For example, when the color components of pixels of the image 1 are divided into color ranges as shown in Table 2 above, and the color conversion command is a first chroma value changing command to increase the saturation value of the R color by 8, the color The range value changing unit 150 includes a color channel (R color channel, RG color channel, RB color) according to a color (R color, RG color, RB color, and RGB color) including all R color components included in the target color. After selecting the highest color range in the color range representing the channel and the RGB color channel), as shown in Table 3 below, the upper limit of the selected color range may be changed.

More specifically, when the color conversion command is a first saturation value changing command for increasing the saturation value of the R color by 8, the color range value changing unit 150 displays the target color in pixels 1 to 4; After selecting a first color range that is the highest color range in the first to third color ranges representing color channels according to a color including all R color components, the upper limit value of the first color range can be changed as shown in Table 3 below. have.

pixel First color range Second color range 3rd color range Upper limit Lower limit Upper limit Lower limit Upper limit Lower limit Pixel 1 200 128 128 64 64 0 Pixel 2 200 96 96 96 96 0 Pixel 3 200 96 96 0 0 0 Pixel 4 200 0 0 0 0 0

In this case, when the color conversion unit 155 receives the Nth color range in which the color range value is changed from the color range value changing unit 150, the color conversion unit 155 may select a value of a color range representing color channels for arbitrary color components of an arbitrary pixel. By calculating the sum of all the values as an arbitrary color component, the color values of the N color components of the pixel may be converted into color values. For example, the color converter 155 may change the color range values as shown in Table 3 below. When the 1 to 3 color ranges are received from the color range value changing unit 150, a value obtained by adding up the values of the color ranges representing the first to third color channels for the R color component is calculated as an arbitrary color component, and the G color. Computes the sum of the values of the color range representing the second and third color channels for the component as any color component, and the value of the color range representing the third color channels for the B color component Both can be calculated as a value obtained by adding the arbitrary color component. Accordingly, the R, G, and B color components of pixel 1 are (200, 128, 64), and the R, G, and B color components of pixel 2 are (200, 96, 96), and R, The G, B color components may be (200, 96, 0), and the R, G, B color components of pixel 4 may be (200, 0, 0).

Further, for example, when the color components of the pixels of image 1 are divided into color ranges as shown in Table 2 above, and the color conversion command is the first chroma value changing command to lower the chroma value of the R color by 2. The color range value changing unit 150 may select a first color range and then change an upper limit value of the first color range as shown in Table 4 below.

pixel First color range Second color range 3rd color range Upper limit Lower limit Upper limit Lower limit Upper limit Lower limit Pixel 1 190 128 128 64 64 0 Pixel 2 190 96 96 96 96 0 Pixel 3 190 96 96 0 0 0 Pixel 4 190 0 0 0 0 0

In addition, when the type of the color conversion command is the second saturation value changing command, the color range value changing unit 150 may be configured according to a color including all color components included in the target color among the N color ranges. You can select the highest color range from the color range that represents the color channel. In this case, when the upper limit value of the color range selected by the color conversion command is changed, the color range value changing unit 150 moves a color range higher than the selected color range by the degree of change of the upper limit value of the selected color range ( A color range higher than the selected color range is a color range representing a color channel according to a color including at least one of the color components included in the target color), or a lower limit of a color range higher than the selected color range. Adjust a value to the upper limit of the selected color range (if the color range higher than the selected color range is not a color range representing a color channel according to a color that includes at least one of the color components included in the target color). You can. Here, when the color range higher than the selected color range is two or more, the color range value changing unit 150 moves the color range one step higher than the selected color range by the degree of change of the upper limit value of the selected color range. Adjust the lower limit of the one-higher color range to the upper limit of the selected color range and move the color range two steps higher than the selected color range by the degree of change of the upper limit of the selected color range; Adjust the lower limit of the higher color range to the upper limit of the next higher color range, move the three higher color ranges by the amount of change in the upper limit of the selected color range, or change the lower limit of the three higher color ranges. Higher than the selected color range in a manner that adjusts to the upper limit of the two high color ranges. For all of the color range it can be moved or adjusted. Here, a color range with a color range of zero is the related color of the color channel represented by the color range one level above that color range of the color channels of the color, depending on the number of color components that can be included if the color range is nonzero. Can be interpreted as being a channel. Here, the relevant color channel of the arbitrary color channel is the color channel according to the color including all the color components of the color according to the arbitrary color channel. For example, if any color channel is an R color channel, the relevant color channel may be an RB color channel, an RG color channel, and an RGB color channel. For example, the color components of the pixels of image 1 may have a color range as shown in Table 2 above. When the color conversion command is a saturation value changing command to increase the saturation value of the RG color by 64, the color range value changing unit 150 includes the R color component and the G color component included in the target color. Select the highest color range from the color range representing the color channels (RG color channel and RGB color channel) according to the colors (RG color and RGB color) including all of them, and then set the upper limit of the selected color range as shown in Table 5 below. You can change it. In addition, when the upper limit value of the selected color range is changed by the color conversion command, the color range value changing unit 150 sets a color range higher than the selected color range as shown in Table 5 below. The lower limit value of the color range higher than the selected color range may be adjusted by the degree of change of, or the upper limit value of the selected color range may be adjusted. In addition, the upper limit value of the color range higher than the selected color range shifted by the degree of change of the upper limit value of the selected color range according to the second saturation value change command is a value of the color value that each of the N color components may have. It may be limited to a maximum value (ie, 255 when the color value is represented by 8 bits). The upper limit value of the color range higher than the selected color range when the upper limit value of the selected color range has a maximum value of each of the N color components according to the second saturation value change command. And the lower limit value may be changed to be equal to the upper limit value of the selected color range (ie, a color range higher than the selected color range is 0).

pixel First color range Second color range 3rd color range Upper limit Lower limit Upper limit Lower limit Upper limit Lower limit Pixel 1 255 192 192 64 64 0 Pixel 2 255 160 160 96 96 0 Pixel 3 255 160 160 0 0 0 Pixel 4 255 64 64 0 0 0

Further, for example, when the color components of pixels of the image 1 are divided into color ranges as shown in Table 2 above, and the color conversion command is a second saturation value changing command to lower the saturation value of the RG color by 64. The color range value changing unit 150 indicates a color channel (RG color channel and RGB color channel) according to a color (RG color and RGB color) including both the R color component and the G color component included in the target color. After selecting the highest color range in the color range, the upper limit value of the selected color range may be changed as shown in Table 5 below. In addition, since the upper limit value of the second color range is changed by the color conversion command, the color range value changing unit 150 sets a color range higher than the selected color range as shown in Table 5 below. The lower limit value of the color range higher than the selected color range may be adjusted by the degree of change of, or the upper limit value of the selected color range may be adjusted. In addition, when the saturation value lowered according to the second saturation value change command is equal to or greater than the selected color range (ie, a value obtained by subtracting a lower limit value from an upper limit value of the selected color range), the color range value changing unit 150 May change the selected color range to 0 (ie, change an upper limit value of the selected color range to be equal to a lower limit value) to perform an operation according to the second saturation value change command.

pixel First color range Second color range 3rd color range Upper limit Lower limit Upper limit Lower limit Upper limit Lower limit Pixel 1 128 64 64 64 64 0 Pixel 2 192 96 96 96 96 0 Pixel 3 128 32 32 0 0 0 Pixel 4 192 0 0 0 0 0

In addition, when the type of the color conversion command is the brightness value changing command, the color range value changing unit 150 indicates a color range representing a color channel according to a color including all N color components among the N color ranges. Can be selected. Here, the upper limit value of the selected color range may be the same as the lowest color value among the color values of the N color components. In this case, when the upper limit value of the color range selected by the color conversion command is changed, the color range value changing unit 150 moves a color range higher than the selected color range by the degree of change of the upper limit value of the selected color range. (If a color range higher than the selected color range is a color range representing a color channel according to a color including at least one of the color components included in the target color), or a color range higher than the selected color range. Adjust the lower limit to the upper limit of the selected color range (when the color range higher than the selected color range is not a color range representing a color channel according to a color comprising at least one of the color components included in the target color. For example, the color components of the pixels of image 1 are shown in Table 2 above. When the color conversion command is divided into the color range, and the color conversion command is a brightness value changing command to increase the brightness value by 64, the color range value changing unit 150 selects a third color range and then displays a third color range as shown in Table 7 below. 3 You can change the upper limit of the color range. In addition, since the upper limit value of the third color range is changed by the color conversion command, the color range value changing unit 150 sets the first and second color ranges as the upper limit value of the third color range as shown in Table 7 below. You can move it by the amount of change. In addition, an upper limit value of the first and second color ranges shifted by a degree of change of the upper limit value of the third color range according to a brightness value change command, for example, is a maximum value of color values that the N color components may have. It may be limited to a value (ie, 255 when the color value is represented by 8 bits). Further, when the upper limit value of the third color range has a maximum value of color values that the N color components may have according to the brightness value change command, the upper limit value and the lower limit value of the first and second color ranges may be determined by the third value. It may be changed to be equal to the upper limit of the color range (ie, the first and second color ranges are zero). Finally, the change in the upper limit value of the third color range plus the upper limit value of the first color range is the maximum value of the color value that the N color components can have (that is, the color value is represented by 8 bits). If more than 255), the upper limit value of the second production range is lowered by the value corresponding to the excess, and then the upper limit value of the third color range is changed to the second color range whose upper limit is lowered by the first color range and the excess. You can move it as much as you change it.

pixel First color range Second color range 3rd color range Upper limit Lower limit Upper limit Lower limit Upper limit Lower limit Pixel 1 255 191 191 128 128 0 Pixel 2 255 159 159 160 160 0 Pixel 3 255 159 159 64 64 0 Pixel 4 255 63 63 64 64 0

Further, for example, when the color components of the pixels of the image 1 are divided into a color range as shown in Table 2 above, and the color conversion command is a brightness value changing command to lower the brightness value by 64, the color range value change. After selecting the third color range, the unit 150 may change the upper limit of the third color range as shown in Table 8 below. In addition, since the upper limit value of the third color range is changed by the color conversion command, the color range value changing unit 150 sets the first and second color ranges as the upper limit value of the third color range as shown in Table 8 below. You can move it by the amount of change. In addition, for example, when the brightness value lowered according to the brightness value change command is equal to or greater than a third color range (ie, a value obtained by subtracting a lower limit value from an upper limit value of the third color range), the color range value changing unit 150 ) Changes the third color range to 0 (ie, changes the upper limit value of the third color range to be equal to the lower limit value), thereby performing an operation according to the brightness value change command.

pixel First color range Second color range 3rd color range Upper limit Lower limit Upper limit Lower limit Upper limit Lower limit Pixel 1 128 64 64 0 0 0 Pixel 2 128 32 32 32 32 0 Pixel 3 192 96 96 0 0 0 Pixel 4 192 0 0 0 0 0

As described above, when the color conversion command is input, the color conversion apparatus according to the present invention selects a color range corresponding to the type of the color conversion command from the N color ranges, and then selects the selected color based on the color conversion change command. By changing the color range value of the range, it is possible to process the color conversion of the digital image at high speed without converting the LAB value. FIG. 2 illustrates a method of operating a color conversion apparatus according to an embodiment of the present invention. It is a flow chart.

Referring to FIG. 2, in step S210, a range of color values that the N color components may have is divided into N color ranges based on the color values of each of the N color components of the pixel.

In operation S220, when a color conversion command is input, a color range corresponding to the type of the color conversion command is selected among the N color ranges, and the color range value of the selected color range is changed based on the color conversion change command. Can be. The type of the color conversion command may be divided into a first chroma value change command, a second chroma value change command, and a brightness value change command.

In the step S220, when the type of the color conversion command is the first saturation value change command, the color channel corresponding to a color including all one color components included in the target color among the N color ranges is represented. You can select the highest color range from the color range.

In the step S220, when the type of the color conversion command is the second saturation value change command, the color channel indicates a color channel according to a color including all of two or more color components included in the target color among the N color ranges. You can select the highest color range from the color range.

In operation S220, when the type of the color conversion command is the brightness value change command, a color range indicating a color channel according to a color including all N color components among the N color ranges may be selected.

In operation S230, the color range values may be converted into color values of the N color components of the pixel based on the changed N color ranges.

In the above, the operation method of the color conversion apparatus according to the embodiment of the present invention has been described with reference to FIG. 2. Here, since the operation method of the color conversion apparatus according to an embodiment of the present invention may correspond to the configuration of the operation of the color conversion apparatus described with reference to FIG. 1, a detailed description thereof will be omitted.

The method of operating a color conversion apparatus according to an embodiment of the present invention may be implemented as a computer program stored in a storage medium for execution by combining with a computer.

In addition, the operating method of the color conversion apparatus according to an embodiment of the present invention may be implemented in the form of program instructions that may be executed by various computer means and may be recorded in a computer readable medium. The computer readable medium may include program instructions, data files, data structures, etc. alone or in combination. Program instructions recorded on the media may be those specially designed and constructed for the purposes of the present invention, or they may be of the kind well-known and available to those having skill in the computer software arts. Examples of computer-readable recording media include magnetic media such as hard disks, floppy disks, and magnetic tape, optical media such as CD-ROMs, DVDs, and magnetic disks, such as floppy disks. Magneto-optical media, and hardware devices specifically configured to store and execute program instructions, such as ROM, RAM, flash memory, and the like. Examples of program instructions include not only machine code generated by a compiler, but also high-level language code that can be executed by a computer using an interpreter or the like.

In the present invention as described above has been described by the specific embodiments, such as specific components and limited embodiments and drawings, but this is provided to help a more general understanding of the present invention, the present invention is not limited to the above embodiments. For those skilled in the art, various modifications and variations are possible from these descriptions.

Therefore, the spirit of the present invention should not be limited to the described embodiments, and all the things that are equivalent to or equivalent to the claims as well as the following claims will belong to the scope of the present invention. .

Claims (12)

Based on a color value of each of the RGB color components of the pixel, a range of color values for the pixel, the first color range, wherein the first color range constitutes the color of the pixel; Is a range of color values according to one of the color channels,-a second color range-the second color range is one of the RG color channels, RB color channels, and GB color channels constituting the color of the pixel. And a third color range, wherein the third color range is a range of color values according to RGB color channels constituting the color of the pixel, wherein the first color range is R color. When the second color range is configured as a range of color values according to the channel, the second color range is configured as a range of color values according to the RG color channel, and the third color range is configured as a range of color values according to the RGB color channel, The pixel Among the R, G and B values, the upper limit value of the first color range is set to R value and the lower limit value is set to G value, and the upper limit value of the second color range is set to G value and the lower limit value is set to B value. A color range dividing unit configured to set an upper limit value of the third color range to a B value and a lower limit value to 0;
When the first saturation value change command for the R color component among the RGB color components of the pixel is input, an upper limit value of the first color range among the first color range, the second color range, and the third color range Is changed to an adjustment value according to the first saturation value changing command, and when a second saturation value changing command for an RG color component among the RGB color components of the pixel is input, the first color range and the second color. An upper limit value of the second color range and a lower limit value of the first color range among the third color range and the lower limit value of the first color range to an adjustment value according to the second saturation value changing command, and the brightness value changing command of the pixel is input. The upper limit value of the third color range and the lower limit value of the second color range among the first color range, the second color range, and the third color range are changed to adjustment values according to the brightness value change command. Is a portion changing color range value; And
When the change of the color range values for the first color range, the second color range, and the third color range is completed, the R value of the RGB color components of the pixel is converted into an upper limit value of the first color range. A color converting unit converting a color value of each of the RGB color components of the pixel by converting a G value to an upper limit of the second color range and converting a B value to an upper limit of the third color range
Color conversion device comprising a. delete delete delete delete Based on a color value of each of the RGB color components of the pixel, a range of color values for the pixel, the first color range, wherein the first color range constitutes the color of the pixel; Is a range of color values according to one of the color channels,-a second color range-the second color range is one of the RG color channels, RB color channels, and GB color channels constituting the color of the pixel. And a third color range, wherein the third color range is a range of color values according to RGB color channels constituting the color of the pixel, wherein the first color range is R color. When the second color range is configured as a range of color values according to the channel, the second color range is configured as a range of color values according to the RG color channel, and the third color range is configured as a range of color values according to the RGB color channel, The pixel Among the R, G and B values, the upper limit value of the first color range is set to R value and the lower limit value is set to G value, and the upper limit value of the second color range is set to G value and the lower limit value is set to B value. Setting an upper limit value of the third color range to a B value and a lower limit value to 0;
When the first saturation value change command for the R color component among the RGB color components of the pixel is input, an upper limit value of the first color range among the first color range, the second color range, and the third color range Is changed to an adjustment value according to the first saturation value changing command, and when a second saturation value changing command for an RG color component among the RGB color components of the pixel is input, the first color range and the second color. An upper limit value of the second color range and a lower limit value of the first color range among the third color range and the lower limit value of the first color range to an adjustment value according to the second saturation value changing command, and the brightness value changing command of the pixel is input. The upper limit value of the third color range and the lower limit value of the second color range among the first color range, the second color range, and the third color range are changed to adjustment values according to the brightness value change command. Step; And
When the change of the color range values for the first color range, the second color range, and the third color range is completed, the R value of the RGB color components of the pixel is converted into an upper limit value of the first color range. Converting a color value of each of the RGB color components of the pixel by converting a G value to an upper limit of the second color range and converting a B value to an upper limit of the third color range.
Operation method of a color conversion device comprising a. delete delete delete delete A computer-readable recording medium having recorded thereon a program for causing a computer to perform the method of claim 6. A computer program stored in a storage medium for executing the method of claim 6 in combination with a computer.

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