Provided by: grass-doc_6.4.3-3_all bug


       d.colors   - Allows the user to interactively change the color table of a raster map layer
       displayed on the graphics monitor.


       display, raster


       d.colors help
       d.colors map=string  [--verbose]  [--quiet]

           Name of raster map


       A color table file associates specific colors with the categories of a raster  map  layer.
       The  user  can  change  these map category color assignments (i.e., change the map's color
       table) interactively, by first displaying the raster map to the graphics monitor and  then
       running the program d.colors.

       Any  color  changes  made  using  d.colors  will  not immediately be shown on the graphics
       display; however, any color changes saved will still alter the map's color table and  will
       appear next time the raster map layer is redisplayed (see d.colortable).

       The  user  must  first  display  the  relevant raster map layer to the active frame on the
       graphics monitor (e.g., using d.rast) before running d.colors. The user  can  then  either
       enter  the  name of the raster map layer whose color table is to be changed on the command
       line (e.g., by typing: d.colors map=soils), or type d.colors without program arguments. If
       the  user  simply  types  d.colors without program arguments on the command line, d.colors
       will ask the user to enter the name of an existing raster map  layer  using  the  standard
       GRASS interface.

       In  either  case,  the user is then presented with the d.colors command menu, shown below.
       The  d.colors  commands  are  listed  beneath  the  Category   Pointer   Movement,   Color
       Modification,  Replotting  Screen,  and  Quitting sections below.  Commands are invoked by
       typing in the single-key response shown to the left below. (Longer descriptions  of  these
       commands  appear  to the right.) Results from invoking these commands will be reflected in
       the Category and Category Number sections of the d.colors screen. On the  d.colors  screen
       menu,  commands  appear  in  the  right  half  of  the  screen,  and the current status of
       categories appears in the left half of the screen.
          0    No Data
          1    (Category 1 description)
          2    (Category 2 description)
          .    ....
          .    ....
          RED         0   0%
          GREEN       0   0%
          BLUE        0   0%
       Shift Incr:   10   3%
          D/d  down (cats)        Move pointer to next category
          U/u  up   (cats)        Move pointer to previous category
          R/r  RED                Increase/decrease RED intensity
          G/g  GREEN              Increase/decrease GREEN intensity
          B/b  BLUE               Increase/decrease BLUE intensity
          I/i  increment          Increase/decrease increment
                                  (of intensity shift)
          h    highlight          Highlight current color
          +/-  shift colors       Shift entire color table (up/down)
          c    save color         Save color table
          t    toggle table       Toggle to different color table
          *    Replot screen      Replots the screen
          Q    quit               Quits program
        Changing categories - The keys "d, D, u," and  "U"  are  used  to  move  to  a  different
       category.  The  lower case letters move up, u, and down, d, the category list one category
       at a time. The upper case letters move 10 categories at a  time  for  fast  movement.  The
       cursor  does  wrap between the first and last categories. The current category is noted on
       the text screen with an arrow, and is indicated on the graphics screen by a box around the
       current color.

       Changing  colors  - The color associated with the current category can be changed with the
       "R, r, G, g, B," and b keys. The upper case letters increase the  intensities  of  red  R,
       green  G,  and  blue  B  for  the  current  category;  the lower case letters decrease the
       intensities of these same colors for the current category.  Video  devices  make  all  the
       colors  of  the  spectrum  by  mixing  red,  green, and blue. For those accustomed to red,
       yellow, and blue being the primary colors, this can be confusing. For starters, yellow  is
       made  by  mixing  red  and  green.  The  intensities  are  listed on the text screen in as

       Keys I and i increase and decrease the percentage change that each keystroke of one of the
       color  keys  (R,  r, G, g, B, b) causes in its respective color. The increase increment is
       initially set to 10%.  Thus, pressing the R key would will increase the red  component  of
       the current category by 10%.

       Highlight - The h key toggles between the current category color and the current highlight
       color. This color is initially black but can be modified as above while in highlight mode.
       Blinking  can be accomplished by repeatedly striking the h key. When changing to different
       categories using the movement keys  as  described  above,  while  in  highlight  mode  the
       category  colors  will  be  always  left showing their actual colors. Only one category is
       highlighted at any one time.

       Saving the current color table - Pressing the c key will save the current color  table  as
       you  have  modified  it.  This table will then be used next time you display or paint this
       raster map layer.

       Color table toggle - Different types of color tables are suitable for different raster map
       layers.   The key t flips between the following color tables: red, green, blue color ramp;
       gray scale; smooth changing color wave; random colors; and the saved color table.

       Color table shift - The entire table is shifted up and down using the + and - keys.

       Quitting the d.colors program - Pressing the Q key will cause you  to  quit  the  d.colors
       program.  If colors have been modified but not saved, d.colors will ask:
                Colors changed
                Save the changes? (y/n)
         The user should type in y to save changes, or n to not save changes, before quitting the
       program.  If the user types n, the program will ask:
                Quit anyway? (y/n)


       The map whose color table is to be altered with d.colors must already be on display in the
       active  display  frame  on  the  graphics monitor before d.colors is run. This can be done
       using the command d.rast map=name (where name is a raster map layer whose color table  the
       user wishes to alter).

       Some  color  monitors  may not support the full range of colors required to display all of
       the map's categories listed in the map's color table.  However, regardless of whether  the
       user  can  see  the color changes he is effecting to a map's color table, any changes to a
       map's color table made with d.colors that are saved will appear in the map's color table.


        d.colortable, d.rast, r.colors


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

       Last changed: $Date: 2011-11-08 01:42:51 -0800 (Tue, 08 Nov 2011) $

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