getcmap - read a color map from a file
int getcmap(char *name, uchar *map)
Getcmap retrieves the named colormap and stores it in map. Usually
name is the name of a colormap file (see cmap(9.6)) or a picfile with a
CMAP= attribute. If the file is not found, it is sought in
If the file cannot be found, and its name has the form gammanumber, a
colormap is fabricated with all three channels of its nth entry set to
255(n/255)1/number. If the name is just gamma, number=2.3 is assumed.
There is no putcmap, because write (in read(2)) can do the job.
cmap(9.6), picfile(9.6) rgbpix(2)