[GRASS-dev] Re: [GRASS GIS] #170: r.colors: make nice random colors like r.watershed

[GRASS GIS]

#170: r.colors: make nice random colors like r.watershed
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  Reporter:  hamish       |       Owner:  grass-dev at lists.osgeo.org
      Type:  enhancement  |      Status:  new                      
  Priority:  minor        |   Milestone:  6.4.0                    
 Component:  default      |     Version:  svn-develbranch6         
Resolution:               |    Keywords:  r.colors                 
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Comment (by glynn):

 Replying to [ticket:170 hamish]:
 > r.watershed has some color rule creation code it in which makes the
 random rules not quite pastel in nature, but cool. it's a lot more
 pleasant than r.color's color=random method.
 >
 > see the r.watershed examples here:
 >   http://grass.osgeo.org/screenshots/raster.php
 >
 > it would be nice to move that rule generation code into libgis and then
 add a new "r.colors color=random_cool" or similar option.
 > (and simplify r.watershed in the process)

 If I'm reading the code correctly, it creates a set of random colours,
 then replaces any dark colours with non-random colours selected from
 generated gradients. IOW, it's a fudge which shouldn't be elevated to a
 library function.

 If you just want to eliminate dark or saturated colours, it would be
 preferable to add transformation functions to adjust and/or clip the
 intensity, saturation and hue, which could then be applied to any existing
 colour rule, not just random colours.

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Ticket URL: <http://trac.osgeo.org/grass/ticket/170#comment:2>
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