Arrangement for mapping colors between imaging systems and method therefor
a color imaging and color mapping technology, applied in the field of color imaging, can solve the problems of inability to accurately convert dark colors, inconvenient color conversion, undesirable color contamination, etc., and achieve the effect of improving its own accuracy and the same dimensionality
Inactive Publication Date: 2006-07-11
EASTMAN KODAK CO
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Benefits of technology
The present invention is about a color mapping method for transforming colors between different color imaging systems. The method involves using profiles that characterize the color imaging systems to generate device-independent color values, which are then converted to device-dependent data values by performing a color conversion. This conversion is iterative and based on differences between the color values of the source and destination systems. The resulting color map describes the relationship between the color imaging systems and can improve the accuracy of the color conversion. The invention also includes a color mapping arrangement and a computer-executable program for performing the color conversion. The technical effects of the invention include improved accuracy and efficiency in color transformation between different color imaging systems.
Problems solved by technology
These techniques exhibit inaccurate color conversion between similar devices, potentially resulting in undesirable contamination of colors.
Furthermore, accurate color conversion of dark colors has often been particularly difficult because of inadequate processing of black channel data in many applications.
Because many devices life incapable of realizing the complete range of colors in a color space, gamut mapping typically involves compressing or scaling regions of the color space.
For many CMSs, gamut mapping is potentially inconsistent under certain circumstances, such as when using profiles generated by software from different vendors.
In addition, many CMSs exhibit inconsistencies when performing forward and reverse transformations between image systems.
Many CMS techniques exhibit other limitations in addition to the lack of accuracy in converting colors.
For example, many CMS techniques are relatively inflexible with respect to changes in illumination and observer conditions, gamut mapping, and choice of color space.
Certain techniques lack forward compatibility with future color standards.
Method used
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[0020]The present invention is believed to be applicable to a variety of systems and arrangements that characterize color imaging systems. The invention has been found to be particularly advantageous for transforming colors between different color imaging systems. An appreciation of various aspects of the invention is best gained through a discussion of these particular application examples.
[0021]According to one aspect of the present invention, a color mapping technique may be applied to a variety of color imaging systems to generate a color map that can be used to transform the color response of one color imaging system, referred to as a source color imaging system, to match the color response of another color imaging system, referred to as a destination color imaging system. The color mapping technique projects color coordinates in the color space used by the source color imaging system into, for example, a device-independent color space. Optimal color coordinates in the color sp...
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A color mapping method is used in transforming colors between color imaging systems. The method includes using forward transformation profiles that characterize the color imaging systems to generate respective sets of device-independent color values for the color imaging systems. Color conversions are calculated by reducing differences between the respective sets of device-independent color values. Based on these color conversions, a color map is constructed that describes a relationship between the color imaging systems.
Description
RELATED APPLICATION[0001]This is a continuation of U.S. patent application Ser. No. 08 / 882,561, filed Jul. 3,1997, now U.S. Pat. No. 6,088,038, the entire content of which is incorporated herein by reference.FIELD OF THE INVENTION[0002]The present invention relates to color imaging. More particularly, the present invention relates to mapping colors between color imaging systems.BACKGROUND OF THE INVENTION[0003]Color reproduction processes typically involve using color imaging systems to produce colors on various media. These color imaging systems may be used to duplicate a color image from one medium to another medium, e.g., from one printed copy to another or from a display screen to a printed copy. Color reproduction processes are used in various application environments, for example, color proofing applications.[0004]Some Color reproduction processes use approaches known as color management systems (CMSs) to characterize various color imaging systems and to transform color data b...
Claims
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IPC IPC(8): G09G5/02H04N1/60
CPCH04N1/6052H04N1/6058
InventorEDGE, CHRISTOPHER J.FISCHER, TIMOTHY A.ROZZI, WILLIAM A.
OwnerEASTMAN KODAK CO