NAME

       r.what.color  - Queries colors for a raster map layer.

KEYWORDS

       raster, querying, color table

SYNOPSIS

       r.what.color
       r.what.color --help
       r.what.color  [-i]  input=string   [value=float[,float,...]]    [format=string]   [--help]
       [--verbose]  [--quiet]  [--ui]

   Flags:
       -i
           Read values from stdin

       --help
           Print usage summary

       --verbose
           Verbose module output

       --quiet
           Quiet module output

       --ui
           Force launching GUI dialog

   Parameters:
       input=string [required]
           Name of existing raster map to query colors

       value=float[,float,...]
           Values to query colors for

       format=string
           Output format (printf-style)
           Default: %d:%d:%d

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

SOURCE CODE

       Available at: r.what.color source code (history)

       Accessed: Tuesday Jun 27 11:13:26 2023

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       © 2003-2023 GRASS Development Team, GRASS GIS 8.3.0 Reference Manual