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Color image forming method and an apparatus employed therefor, and a correction factor determining method

  • US 5,422,738 A
  • Filed: 04/18/1994
  • Issued: 06/06/1995
  • Est. Priority Date: 10/22/1990
  • Status: Expired due to Term
First Claim
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1. A method of forming a color image which comprises the steps of:

  • a) subjecting three primary color luminance signals (R,G,B) of additive color mixture to matrix conversion into second luminance signals (R'"'"', G'"'"', B'"'"')b) subjecting each color of said second luminance signals (R'"'"', G'"'"', B'"'"') to complementary color conversion into three primary color density signals (DR, DG, DB) of subtractive color mixture,c) subjecting each color of said three primary color density signals (DR, DG, DB) to non-linear conversion into signals (C'"'"', M'"'"', Y'"'"') by first non-linear function of monotone increase, with derivative thereof being also of monotone increase,d) converting the signals (C'"'"', M'"'"', Y'"'"') into signals (C",M",Y") by linear matrix calculation, ande) further subjecting said signals (C",M",Y") to non-linear conversion into ink density signals (C,M,Y) to be used for recording by second non-linear function of monotone increase, with derivative thereof being of monotone decrease, which is of an inverse function of said first non-linear function,wherein steps a) through e) are performed sequentially,whereby the ink density is controlled according to said ink density signals (C,M,Y) for effecting color recording.

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