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#!N
#!N #!Rudfcmps Using
Default Color Maps #!N #!N #!N When displaying non-delayed color images
in 8-bit windows, Display assumes that it can specify 225 individual
colors. If this number is not currently available in the shared
color map, Display will find the best approximations available. However, this
may lead to a visible degradation of image quality. Display may
instead use a private color map. This decision is based on
the worst-case approximation that it must use with the default color
map. If this approximation exceeds a threshold, a private color map
will be used. The approximation quality is measured as Euclidean distance
between the desired color and the best approximation for that color,
in an RGB unit cube. #!N #!N An environment variable, DX8BITCMAP,
sets the level at which the change to using a private
color map is made. The value of DX8BITCMAP should be a
number between 0 (zero) and 1 (one), and it represents the
Euclidean distance in RGB color space, normalized to 1, for the
maximum allowed discrepancy. If you set DX8BITCMAP to 1, then a
private color map will never be used. On the other hand,
if you set DX8BITCMAP to -1, then a private color map
will always be used. The default is 0.1. See also the
-8bitcmap command line option for Data Explorer in #!Lclopts6,dxall744 t Table 6 #!EL in IBM
Visualization Data Explorer User's Guide. #!N #!N #!N #!F-adobe-times-medium-i-normal--18* Next Topic
#!EF #!N #!N #!Lgammaco,dxall815 h Gamma Correction #!EL #!N #!F-adobe-times-medium-i-normal--18* #!N
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