Computer graphics processing and selective visual display system – Computer graphics processing – Graph generating
Patent
1995-06-07
1998-04-21
Nguyen, Phu K.
Computer graphics processing and selective visual display system
Computer graphics processing
Graph generating
H04N 146
Patent
active
057422966
ABSTRACT:
An image processing method for executing image data conversion between different types of input and output devices having different color reproduction ranges, and an apparatus therefor are disclosed. A device independent color reproduction range is calculated in, e.g., a CIE L*a*b* uniform color space, and a color reproduction range depending on a device such as a binary recording color printer is calculated. Only a saturation is compressed at a compression ratio corresponding to the ratio of the two calculated color reproduction ranges. Thus, when an output device outputs a color image, image qualities (color reproducibilities) of input and output images can be equalized. Even when a color outside the color reproduction range of the output device is to be output, a satisfactory output which preserves gradation characteristics can be obtained.
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Sugiura Susumu
Yamada Osamu
Yasuda Yoshizumi
Canon Kabushiki Kaisha
Nguyen Phu K.
Vo Cliff N.
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