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Color correction using a device-dependent display profile

A device-related and device-independent technology, applied in static indicators, cathode ray tube indicators, instruments, etc., to solve the problems of different, soft proofing cannot be carried out effectively, difficult visual matching, etc.

Inactive Publication Date: 2006-03-08
KODAK POLYCHROME GRAPHICS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] However, the main problem with soft proofing is that it is difficult to achieve a good visual match between the colors displayed on the soft proof display device and the colors that appear on the actual printed hard copy
Also, in theory, colors displayed using RGB device coordinates are often visually equivalent to hard copy printed colors
In practice, however, even though images displayed by soft and hardcopy media produce essentially the same device-independent values, the colors appearing on the display will appear different from those on hardcopy printed output
If soft proofing shows that the colors on the device do not provide an acceptable visual match to the colors on the hard copy printed output, then soft proofing cannot be done effectively and cannot be widely adopted in the industry

Method used

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  • Color correction using a device-dependent display profile
  • Color correction using a device-dependent display profile
  • Color correction using a device-dependent display profile

Examples

Experimental program
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Effect test

example 1

[0111] The matrix M HC→CRT -1 Can be automatically applied in the driver software or EPROM of the device used to measure XYZ (or equivalent) measurement data. Thus, all analog and digital settings of the CRT (most notably white point or color temperature settings) will automatically correlate well with lighting conditions for viewing reflected images. Additionally, all measured XYZ data will be automatically corrected. If the measurement device is used to set the D50 white point on a CRT, then the ICC profile can be generated in a standard way. Will produce a good visual match between CRT and hard copy.

[0112] Such as Kodak ColorFlow TM and Gretag-Macbeth ProfileMaker TM Certain color measurement tools in the .com measure 100% of R, G, B, and a range of grays ranging from black to white. Additionally, other ICC tools can measure additional combinations of RGB color values. Most of the public results are simple matrix / TRC profiles based directly on the XYZ measurement ...

example 2

[0117] The matrix M HC→CRT The XYZ values ​​of the illumination (e.g. D50) that can be applied to the hardcopy, in order to derive the corresponding CRT white point values ​​in the XYZ of the CRT:

[0118] X CRT Y CRT Z CRT = M HC - > CRT X HC Y HC Z HC = M ...

example 3

[0127] put the matrix M HC→CRT Applied to the XYZ values ​​of the hardcopy to derive the corresponding values ​​in XYZ for the CRT.

[0128] X CRT Y CRT Z CRT = M HC - > CRT X HC Y HC Z HC

[0129] Recall that a matrix for a CRT can be constructed from a combination of the CRT's chromi...

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Abstract

A method includes obtaining a chromatic correction for a display device based on a device-dependent display profile. The method may ensure that images that appear on a display device in a soft proofing environment will be visually equivalent to images that appear on print media.

Description

[0001] This application claims priority to US Application Serial No. 60 / 443,939, filed January 30, 2003, which is hereby incorporated by reference in its entirety. technical field [0002] The present invention relates to color imaging and, more particularly, to techniques for rendering color images on display devices. Background technique [0003] A color imaging device uses a combination of different device-dependent coordinates to form a color image for display or printing on a medium such as paper or film. Many hardcopy printing devices use a combination of cyan, magenta, yellow, and black (CMYK) to form color images. These device-dependent coordinates C, M, Y and K may be combined to form a gamut of colorimetric values ​​that the device is capable of producing. Display devices such as cathode ray tubes (CRTs) or flat panel monitors may use red, green and blue (RGB) device-dependent coordinates. Some high-fidelity color imaging devices may use device-dependent coordina...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04N1/60H04N1/62
CPCH04N1/6052H04N1/6088H04N1/622G09G5/02
Inventor C·J·埃奇
Owner KODAK POLYCHROME GRAPHICS