Values may be specified either using the values= option, or by specifying the -i flag and passing the values on stdin, one per line.
For each value which is specified, a line of output will be generated consisting of the category value followed by the color, e.g.:
r.what.color input=elevation.dem value=1500 1500: 223:127:31
If the input map is an integer (CELL) map, the category will be written as an integer (no decimal point), otherwise it will be written in floating point format (printf("%.15g") format).
If the lookup fails for a value, the color will be output as an asterisk, e.g.:
r.what.color input=elevation.dem value=9999 9999: *
If a value cannot be parsed, both the value and the color will be output as an asterisk, e.g.:
r.what.color input=elevation.dem value=bogus *: *
The format can be changed using the format= option. The value should be a printf()-style format string containing three conversion specifiers for the red, green and blue values respectively, e.g.:
r.what.color input=elevation.dem value=1500 format='%02x:%02x:%02x' 1500: df:7f:1f
If your system supports the %m$ syntax, you can change the ordering of the components, e.g.:
r.what.color input=elevation.dem value=1500 format='%3$02x:%2$02x:%1$02x' 1500: 1f:7f:df
Common formats: