[GRASS-dev] [GRASS GIS] #778: i.rgb.his, i.his.rgb: propagate NULLs

[GRASS GIS]

#778: i.rgb.his, i.his.rgb: propagate NULLs
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 Reporter:  hamish                |       Owner:  grass-dev@…              
     Type:  defect                |      Status:  new                      
 Priority:  major                 |   Milestone:  7.0.0                    
Component:  Raster                |     Version:  svn-trunk                
 Keywords:  i.rgb.his, i.his.rgb  |    Platform:  All                      
      Cpu:  Unspecified           |  
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Changes (by cmbarton):

  * priority:  minor => major


Comment:

 This remains a serious hidden bug. At the very least, it should be
 documented in the manuals for these routines. Especially for remote
 sensing imagery, 0 is a meaningful value. To mix 0's with nulls is to
 corrupt the information in the image. Because of the potential for data
 corruption and because it is an undocumented behavior that differers from
 most (all?) other raster modules, I'm also upping the priority to major.

 Note that because neither i.rgb.his or i.his.rgb deal with nulls
 correctly, they cannot be used with a MASK.

 Is this difficult to fix?

 Michael

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Ticket URL: <https://trac.osgeo.org/grass/ticket/778#comment:1>
GRASS GIS <http://grass.osgeo.org>