Facsimile and static presentation processing – Static presentation processing – Attribute control
Patent
1990-07-27
1991-10-22
Groody, James J.
Facsimile and static presentation processing
Static presentation processing
Attribute control
358 22, H04N 974, G03F 308
Patent
active
050600605
ABSTRACT:
A color image processing apparatus comprises: a circuit to provide a color image signal comprising a luminance signal and two color difference signals; a converter to convert the two color difference signals into a hue signal and a saturation signal; a compressing circuit to independently compress the dynamic range of one or both of the luminance signal and the saturation signal a memory to store the hue signal and the output of the compressing circuit; and a color printer to reproduce the color image on the basis of the hue signal, and signals stored in the memory. The compressing circuit performs the compression on the basis of a frequency distribution of the input signal levels. With this apparatus, the color balance can be automatically adjusted by use of correction ROMs of a small memory capacity.
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Takiguchi Hideo
Udagawa Yoshiro
Canon Kabushiki Kaisha
Groody James J.
Vu Kim Yen
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