Claims
- 1. A color image processing apparatus for transmitting color image data to an image forming apparatus, comprising:
- hue correction table for storing coordinate information of color components on a non-linear hue line expressing the same hue components in a uniform color space;
- color gamut mapping means for mapping color image data which lie outside of a color reproducible range of the image forming apparatus, along the non-linear hue line by using the coordinate information of said hue correction table; and
- first output means for outputting the color image data mapped by said color gamut mapping means to the image forming apparatus.
- 2. A color image processing apparatus according to claim 1, wherein said uniform color space is expressed by L*a*b*.
- 3. A color image processing apparatus according to claim 1, wherein said color gamut mapping means maps the color image data which lie outside of the color gamut of the image forming apparatus into the color reproducible range.
- 4. A color image processing method for transmitting color image data to an image forming apparatus, comprising the steps of:
- mapping color image data which lie outside of a color reproducible range of the image forming apparatus, on a non-linear hue line expressed and constructed by the same hue component as the color image data in a uniform color space by using a table, wherein the table stores coordinate information of color components on the non-linear hue line expressing the same hue components in the uniform color space; and
- outputting the color image data mapped in said mapping step to the image forming apparatus.
- 5. A color image processing method, comprising the steps of:
- inputting color image data; and
- performing color gamut mapping on the color image data;
- wherein in said color gamut mapping step, hue and saturation of the color image data are converted with respect to a hue of the color image data based on a predefined non-linear locus corresponding to the hue, so that the color image data is mapped into a color gamut of an image output device.
- 6. A color image processing method according to claim 5, wherein the predefined non-linear locus represents the same hue in uniform color space.
- 7. A color image processing method according to claim 5, wherein in said color gamut mapping step, the color image data outside the color gamut of the image output device is mapped on a boundary of the color gamut.
- 8. A color image processing method according to claim 5, further comprising the step of:
- outputting an image based on the color image data mapped in said color gamut mapping step.
- 9. A color image processing method, comprising the step of:
- inputting color image data expressed by a plurality of components corresponding to a plurality of coordinates respectively;
- selecting one of the plurality of coordinates in accordance with a manual operation; and
- mapping the color image data in a color gamut of an image output apparatus, in a condition in which a component of the color image data corresponding to the selected coordinate is fixed and other components of the color image data are converted.
- 10. A color image processing method according to claim 9, wherein said image data is expressed in a color uniform space and each of the plurality of components of color coordinates corresponds to brightness, hue and chromaticness, respectively.
- 11. A color image processing apparatus comprising:
- input means for inputting color image data expressed by a plurality of components corresponding to a plurality of coordinates respectively;
- selecting means for selecting one of said plurality of coordinates in accordance with a manual operation; and
- color gamut mapping means for mapping the color image data in a color gamut of an image outputting apparatus, in a condition in which a component of the color image data corresponding to the selected coordinate is fixed and other components of the color image data are converted.
- 12. A color image processing apparatus, comprising:
- input means for inputting color image data; and
- color gamut mapping means for performing color gamut mapping on the color image data input by said input means;
- wherein said color gamut mapping means modifies hue and saturation of the color image data with respect to a hue of the color image data, based on a predefined non-linear locus, so that the color image data is mapped into a color gamut of an image output device.
- 13. A color image processing apparatus for transmitting color image data to an image forming apparatus comprising:
- color gamut mapping means for mapping color image data which lie outside of a color reproducible range of the image forming apparatus, along a non-linear hue line expressed and constructed by the same hue components of the color image data in a uniform color space; and
- first output means for outputting the color image data mapped by said color gamut mapping means to the image forming apparatus,
- wherein said color gamut mapping means converts the color image data which lie outside of the color gamut of the image forming apparatus, along an axis between maximum and minimum saturations of the same hue component of the color image data in the uniform color space, and after mapping the color image data along the axis, reconverts the mapped color image data along said non-linear hue line.
Priority Claims (4)
Number |
Date |
Country |
Kind |
2-314217 |
Nov 1990 |
JPX |
|
2-314219 |
Nov 1990 |
JPX |
|
3-002842 |
Jan 1991 |
JPX |
|
3-056858 |
Mar 1991 |
JPX |
|
Parent Case Info
This application is a continuation of application Ser. No. 07/785,097 filed Oct. 30, 1991, now abandoned.
US Referenced Citations (9)
Continuations (1)
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Number |
Date |
Country |
Parent |
785097 |
Oct 1991 |
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