The GRASS program d.colortable is used to display the color table associated with a raster map layer in the active frame on the graphics monitor. The map name should be an available raster map layer in the user's current mapset search path and location.

If the values of both lines and cols are not specified by the user, d.colortable divides the active frame equally among the number of categories present in the named raster map layer. If one option is specified, the other is automatically set to accommodate all categories. If both are specified, as many categories as possible are displayed.

If the user specifies the name of a map on the command line but does not specify the values of other parameters, parameter default values will be used. Alternately, if the user types simply d.colortable on the command line without any program arguments, the program will prompt the user for parameter settings using the standard GRASS parser interface.


The user running the command:
d.colortable map=soils color=red lines=1 cols=3
would see the active graphics frame divided into three columns extending the full frame height. The lines dividing the color table associated with the soils map would be displayed in red. The user would see, at most, only three of the colors from the soils color table displayed in the active frame (because the user requested that this frame be divided into three sections).


If the user wishes to display the entire color table associated with a map, the user should either stipulate a number of lines (rows) and columns (cols) sufficient to accommodate the number of categories in the map's color table, or fail to assign values to one or both of lines and/or cols. If the user runs d.colortable using the default number of lines and columns (the full graphics frame), all categories from the map's color table will be displayed. However, if the user requests that the color table associated with a map which has 10 data categories be displayed in a graphics frame with only 3 lines (rows) and 2 columns (a total of six cells), only six of the ten map categories will be displayed.

The user should run the GRASS program d.erase between runs of d.colortable to avoid confusion.




James Westervelt, U.S. Army Construction Engineering Research Laboratory

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