Patent ID: 7453591

Claim:
A method of gray balance adjustment and color saturation adjustment comprising: determining a relative amount of gray in initial CMY data values; determining a relative amount of chroma in the initial CMY data values; and for each of the initial CMY data values, adding a portion of a corresponding maximum gray balance adjusted value and a portion of a corresponding maximum color saturation adjusted value to produce respective gray balance adjusted and color saturation adjusted CMY data values; and wherein the portion of a corresponding maximum gray balance adjusted value is a function of the relative amount of gray and the portion of the maximum saturation adjusted value is a function of the relative amount of chroma, wherein: determining a relative amount of gray comprises determining a relative amount of gray using: RATIO=MIN( C, M, Y )/MAX( C, M, Y ) wherein MIN(C, M, Y) is a minimum of the initial CMY data values and MAX(C, M, Y) is a maximum of the initial CMY data values; determining a relative amount of chroma comprises calculating (1-RATIO); and adding a portion of a corresponding maximum gray balance adjusted value and a portion of a corresponding maximum color saturation adjusted value to produce respective gray balance adjusted and color saturation adjusted CMY data values comprises: C =GRAYBAL C ( C )*RATIO+SAT C ( C )*(1-RATI-O) M =GRAYBAL M ( M )*RATIO+SAT M ( M )*(1-RATIO) C =GRAYBAL Y ( Y )*RATIO+SAT Y ( Y )*(−1-RATIO) wherein GRAYBAL C(C), GRAYBAL M(M) and GRAYBAL Y(Y) are maximum gray balance adjusted values, and SAT C(C), SAT M(M) and SAT Y(Y) are maximum color saturation adjusted values.