## DESCRIPTION

r.what.color outputs the color associated with user-specified category values in a raster input map.

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:

- Tcl/Tk: `format="#%02x%02x%02x"`
- WxPython: `format='"#%02x%02x%02x"'` or `format='"(%d,%d,%d)"'`

## SEE ALSO

r.what

## AUTHOR

Glynn Clements

Last changed: $Date$