Method of converting image data, image data conversion...

Details Method of converting image data, image data conversion... Method of converting image data, image data conversion...

2006-04-17

2008-09-30

Haskins, Twyler L. (Department: 2625)

Facsimile and static presentation processing

Natural color facsimile

Color correction

C358S001900

Reexamination Certificate

active

07430069

ABSTRACT:
A conversion computation section acquires the original color density value of a single process color in a given image region and the original color density value of a spot color from raster data, and acquires a pseudocolor conversion rate for conversion from the spot color to the process color from spot color information. Then, the conversion computation section calculates a proof color density value Hiof each process color on a pixel-by-pixel basis in each image region by using a conversion computation expressed by Hi=Pi+s·Gi−Pi·s·Giwhere Pi(i=C, M, Y or K) is the original color density value of the single process color, s is the original color density value of the spot color, and Giis the pseudocolor conversion rate for conversion from the spot color to the process color. The proof color density value reflects a change in gradation of the process color and a change in gradation of the spot color without the saturation of the color density.

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