Appeal No. 95-1423
Application 07/928,883
While Nopp admittedly does not change the color tone
(Nopp page 4, line 21 to page 4a, line 2), this is taught by
Havel. Havel is directed to solving the same problem as Nopp,
namely, improving legibility of a color display by improving
contrast between displayed characters and their backgrounds
(Havel,
col. 1, lines 36-41). Havel accomplishes this by changing
the output color of the background to a complementary color of
the displayed character (Havel, col. 6, lines 14-20). This
transformation of one input color to a different output color,
depending on the color of the character and/or stored
supporting character information teaches the broadly claimed
“cross-color mapping” function of claims 61 and 69.
We find that one of ordinary skill in the art, faced with
the problem of improving legibility of a color display, would
have been motivated to modify the system of Nopp to provide
for color change, rather than merely increasing brightness,
according to the teachings of Havel. In view of the teachings
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