background color in a MASK

Andrew Hertz hertz at
Sat Aug 21 18:19:04 EDT 1993

Change the entry in the color file (colr directory) for values outside
masked area (0=no data) from white (255) to black (0).  For version 4.1
color files either change the entry 0:255 (or maybe 0:255:255:255) to
0:0, or if there's no entry for 0 values add the entry 0:0.

Note:  The color files have changed in 4.1, however it doesn't appear
me that the maps in the spearfish/PERMANENT mapset have been
updated, so using these for examples may be misleading/confusing.

Happy color twiddling,

Andrew Hertz
hertz at

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