#!F-adobe-helvetica-medium-r-normal--18* #!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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