Patent ID: 7488053
Filing Date: 2009-02-10
Classification: H04N

Abstract:
1. A color ink set for monochromatic image printing, said color ink set comprising: a plurality of black inks each different in brightness based on a difference in brightness of separate sheets of white printing paper onto which 100% of one of each of the black color inks are ejected independently; a plurality of cyan color inks each different in brightness based on a difference in brightness of separate sheets of white printing paper onto which 100% of one each of the cyan color inks are ejected independently; a plurality of magenta color inks each different in brightness based on a difference in brightness of separate sheets of white printing paper onto which 100% of one of each of the magenta color inks are ejected independently; a yellow color ink; wherein, a brightness of a white printing paper onto which 100% of the yellow color ink is ejected is higher than the brightness of a white printing paper onto which a cyan color of a highest brightness is ejected; and the brightness of the white printing paper onto which 100% of the yellow color ink is ejected is higher than the brightness of a white printing paper onto which a magenta color of a highest brightness is ejected.