Appeal No. 1997-4047 Page 9
Application No. 08/309,508
that McColl “teach[es] means for converting primary color
signals into secondary color signals and means for
reconverting the secondary color signals back to primary color
signals.” (Paper No. 9 at 4.) More specifically, the primary
reference shows converting (RGB) vectors into (Y>0) vectors
and reconverting the (Y>0) vectors back into (RGB) vectors.
Fig. 4. These disclosures teach (or would have suggested) the
claimed “means for converting color signals in a first color
space into corresponding color signals in a second color
space,” and the claimed “means for reconverting converted
color signals in said second color space into corresponding
color signals in said first color space ....”
The primary reference teaches even more. McColl
discloses, “some (Y>0) vectors may be forced to lie outside
the bounds of RGB colour space .... [w]here necessary,
codewords are reassigned to the nearest neighbour in the
chromaticity alphabet so that the (Y>0) vector is known to lie
within the bounds of the RGB colour space.” P. 96. In
summary, the primary reference compensates converted (Y>0)
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