R (1) Linux Manual Page

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

Keywords

raster

Synopsis

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

Flags:

-i: Read values from stdin
–verbose: Verbose module output
–quiet: Quiet module output

Parameters:

input=string: 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("%f") 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)"’

Author

Glynn Clements

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