A color processing apparatus performs the masking process of a color image by receiving a plurality of color component signals, and has a masking circuit for performing a linear masking process for the plurality of color component signals. The masking process utilizes a plurality of coefficients each...http://www.google.de/patents/US4853768?utm_source=gb-gplus-sharePatent US4853768 - Color image processing apparatus with linear masking circuit having coefficients which vary in accordance with the levels of color component signals
