A graphics data processing apparatus having graphic image operations on two images. Two graphic images are formed into a single combined image based upon a predetermined combination of the multibit color codes representing corresponding pixels of the two images. A transparent color code is permitted...http://www.google.es/patents/US4752893?utm_source=gb-gplus-sharePatente US4752893 - Graphics data processing apparatus having image operations with transparent color having a selectable number of bits
Graphics data processing apparatus having image operations with transparent ...
