EP0653879A2
Expired / Lapsed
EP
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Method of and system for predicting a colour reproduction image
Assignee: Fujifilm Holdings Corp
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Filing: 1994-11-17
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Granted: —
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Expires: 2014-11-17
Abstract
Abstract YMCK halftone dot percentage data from an image editor 12 are converted into color image data in an XYZ colorimetric system with a common color space conversion table generated by a common color space conversion table generator 20. The color image data are converted into a gamut mapping and appearance corresponding to an image monitor device 14A with a gamut mapping/appearance table generated by a gamut mapping/appearance generator 22. Then, the color image data are converted into color image data in a device color space of an image output unit 14A with a device color space conversion table generated by a device color space conversion table generator 24 for thereby predicting a color image which will be reproduced by the image output unit 14B. Alternatively, the YMCK halftone dot percentage data from the image editor 12 may be corrected using dot gain correcting coefficients established respectively for tristimulus values X, Y, Z, and then converted into color image data in the XYZ color space with a common color space conversion table.
Inventors
- 👤 Shuichi C/O Fuji Photo Film Co. Ltd. Ohtsuka
- 👤 Akira C/O Fuji Photo Film Co. Ltd. Yoda
- 👤 Yoshinori C/O Fuji Photo Film Co. Ltd. Usami
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-09 14:02
CPC Classifications
H; H04; H04N; H04N1/00; H04N1/46; H04N1/56; H04N1/60; H04N1/6011; H04N1/603
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
147 words
A system for predicting a reproduced color image in producing a color printed material from processed input color image data through a platemaking and printing process and outputting a color image corresponding to the color printed material, comprising: printing condition profiles which represent printing conditions of the color printed material established as parameters; data conversion profiles which represent color space data conversion formulas established for converting the processed input color image data into data in a color space of an image monitor device using the parameters represented by said printing condition profiles; and converting means for converting the processed input color image data into the data in the color space of the image monitor device according to said color space data conversion formulas; the arrangement being such that a color image corresponding to the color printed material can be displayed from the data in the color space.
Claim 2
Dependent Claim
77 words
A system according to claim 1, wherein said color space data conversion formulas comprise: at least one first color space data conversion formula for converting the processed input color image data into data in a common color space using parameters represented by said printing condition profiles; and at least one second color space data conversion formula for converting the data in the common color space into data in a device color space of the image monitor device.
Claim 3
Dependent Claim
70 words
A system according to claim 2, wherein the processed input color image data comprise data corresponding to an area ratio of an output image, and the data in the common color space comprise tristimulus values of a CIE colorimetric system, and wherein said first color space data conversion formula comprises a Neugebauer's equation for converting the data corresponding to the area ratio into the data in the common color space.
Claim 4
Dependent Claim
55 words
A system according to claim 1, wherein said data conversion profiles comprise: basic profiles representing at least one color space data conversion formula for converting the processed input color image data into the data in the color space; and subprofiles representing selectable formulas and/or parameters corresponding to variables of said color space data conversion formula.
Claim 5
Independent Claim
108 words
A method of predicting a reproduced color image in generating area modulation data of respective color materials from processed input color image data and producing a color printed material based on the area modulation data, comprising the steps of: correcting the area modulation data based on dot gain correcting coefficients established for respective color representing coordinates of an image with respect to the respective color materials of the color printed material; generating color image data of the color representing coordinates from the corrected area modulation data; and displaying a color image corresponding to the color printed material based on the color image data of the color representing coordinates.
Claim 6
Dependent Claim
22 words
A method according to claim 5, wherein the color representing coordinates comprise tristimulus values X, Y, Z in a CIE-XYZ colorimetric system.
Claim 7
Dependent Claim
22 words
A method according to claim 5, wherein the color representing coordinates comprise tristimulus values B, G, R in a BGR colorimetric system.
Claim 8
Dependent Claim
29 words
A method according to claim 5, wherein the dot gain correcting coefficients include corrective terms depending on area modulation data of a color material other than the color materials.
Claim 9
Independent Claim
162 words
A system for predicting a reproduced color image in generating area modulation data of respective color materials from processed input color image data, producing a color printed material based on the area modulation data, and displaying a color image corresponding to the color printed material, comprising: printing condition profiles which represent printing conditions established as parameters, the printing conditions including dot gain correcting coefficients established for respective color representing coordinates of an image with respect to the respective color materials of the color printed material; corrective formula profiles which represent corrective formulas established for correcting the area modulation data based on the dot gain correcting coefficients; and conversion formula profiles which represent conversion formulas established for converting the corrected area modulation data into color image data corresponding to the respective color representing coordinates; the arrangement being such that color image data suitable for an image monitor device can be produced from the color image data corresponding to the respective color representing coordinates.
References Cited (Backward Citations)
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