Appeal No. 98-1474 Page 2
Application No. 08/579,385
black, which is a combination of cyan, magenta, yellow, and
black (C, M, Y, K). Black colorant has a different gloss than
process black. Accordingly, a more pleasing print will be
made if process black is used over a colored (i.e., a C, M, Y)
background and black colorant is used over a white or gray
background. Also, process black exhibits slight edges of C,
M, Y color if its layers of color are not perfectly aligned.
Such edges are obvious over a gray or white background not
over a colored background.
Claim 1, which is representative for our purposes,
follows:
1. In a system which uses electronic signals
to specify black and non black colorants to be used
in a printing process to print a grey area over a
background area, a method for determining colorants
to be used to print said grey area comprising the
steps of:
testing said signals to determine if the
background is to be printed using a non black
colorant,
if a non black colorant is to be used to print
the background, generate a signal specifying that
said grey color will comprise a non black colorant,
and
printing said grey area.
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Last modified: November 3, 2007