Appeal No. 1997-4047 Page 3
Application No. 08/309,508
BACKGROUND
The invention at issue in this appeal converts and
reconverts color signals between two different color spaces in
an environment where reconverted color signals are confined in
their dynamic range. Input and output color signals are
formatted in the same color space, viz., red-green-blue (RGB),
and intermediate color signals are formatted in a different
color space, viz., luminance-chrominance-red-chrominance-blue
(YCrCb).
The invention first converts input signals in the RGB
color space into intermediate signals in the YCrCb color
space. Then, it compensates at least one of the intermediate
color signals by replacing an out-of-range value therein with
a nearest value that is in-range. Later, the compensated
intermediate color signals are compressed, stored, read,
decompressed, and reconverted into output color signals in the
RGB color space. By compensating the intermediate color
signals instead of the output color signals, the invention
eliminates the prior art’s time consuming steps of checking
and possibly compensating output color signals within the
reconversion process.
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