#967: r.out.png: respect TRANSPARENT and COMPRESSION enviro vars
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 Reporter:  hamish       |       Owner:  [email protected]
     Type:  enhancement  |      Status:  new                      
 Priority:  normal       |   Milestone:  7.0.0                    
Component:  Raster       |     Version:  svn-trunk                
 Keywords:  r.out.png    |    Platform:  All                      
      Cpu:  All          |  
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 Hi,

 Peter Löwe discovered that r.out.png does not respect GRASS_TRANSPARENT or
 GRASS_PNG_COMPRESSION, which limits the module's usefulness.  (especially
 the lack of NULL->alpha)

 I'm guessing we should have it respect both GRASS_TRANSPARENT and a module
 flag, if they conflict I guess go with the enviro variable.

 Same for compression with a module option=1-9.


 a work-around for now is to use the PNG driver with GRASS_WIDTH and HEIGHT
 taken from the image meta data.


 thanks,
 Hamish

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Ticket URL: <https://trac.osgeo.org/grass/ticket/967>
GRASS GIS <http://grass.osgeo.org>
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