[GRASS-dev] Re: [GRASS GIS] #774: i.rgb.his, i.his.rgb, d.his support for >8 bit

GRASS GIS trac at osgeo.org
Tue Oct 6 23:58:44 EDT 2009

#774: i.rgb.his, i.his.rgb, d.his support for >8 bit
  Reporter:  hamish       |       Owner:  grass-dev at lists.osgeo.org  
      Type:  enhancement  |      Status:  new                        
  Priority:  normal       |   Milestone:  6.5.0                      
 Component:  Raster       |     Version:  svn-develbranch6           
Resolution:               |    Keywords:  i.rgb.his, i.his.rgb, d.his
  Platform:  All          |         Cpu:  All                        
Comment (by hamish):

 updated patch attached allowing >8 bit support for i.rgb.his and
 i.his.rgb. Patch is against latest 6.5svn.

 Note round-trip is a little lossy due to hexagonal approximation to the
 color-cone. TODO: use real cone geometry maths.

 These modules write out colr/ tables as min,max of channel. Would it be
 better to write them out as 0,max_level for the particular bit-depth? e.g.
 0,255 for 8-bit and 0,2047 for 11-bit. Then d.rgb and d.his give natural
 looking results without subtle extra steps.


Ticket URL: <https://trac.osgeo.org/grass/ticket/774#comment:3>
GRASS GIS <http://grass.osgeo.org>

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