Appeal No. 1997-4047 Page 14
Application No. 08/309,508
The examiner errs in determining the content of the prior
art. Walowit includes the following teaching about
compensation.
In one embodiment, an irreproducible color is
brought to the edge of the gamut by determining the
shortest vector distance from the color to the
gamut. In another embodiment, the achromatic
component is preserved as nearly as possible and
only the chromatic components are adjusted to bring
the color to the gamut in such a way that hue
constancy is nearly preserved. In yet another
embodiment, the colors are not clipped. Rather, all
colors are compressed such that the range of input
colors just fits within the range of output colors.
This compression can also be done selectively and
non-linearally, [sic] such that for every quantized
achromatic level and hue level, the chromatic
component is compressed to fit within the output
range possible for the chromatic and achromatic
levels while preserving hue as nearly as possible.
Similar compressions can be performed as a function
of saturation, lightness, hue or any other color
metric. Col. 10, ll. 12-26.
In summary, the reference teaches changing the level of
chromatic components while maintaining an achromatic component
at a constant level. Because Walowit teaches the latter, the
reference neither teaches nor would have suggested changing
the value of the claimed component Y, which is achromatic.
AAPA does not cure this deficiency.
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