[GRASS-dev] [GRASS GIS] #72: PNG driver: boundary rendering is off by one pixel

GRASS GIS trac at osgeo.org
Tue Jun 4 00:23:40 PDT 2013

#72: PNG driver: boundary rendering is off by one pixel
 Reporter:  hamish                         |       Owner:  grass-dev@…              
     Type:  defect                         |      Status:  new                      
 Priority:  critical                       |   Milestone:  6.4.4                    
Component:  Default                        |     Version:  svn-develbranch6         
 Keywords:  d.vect, rendering, PNG_DRIVER  |    Platform:  Unspecified              
      Cpu:  Unspecified                    |  

Comment(by hamish):


 there is a similar off-by-one problem in the Cairo driver for 6.4 and 6.5,
 very easy to reproduce:

 export GRASS_WIDTH=100
 export GRASS_HEIGHT=100
 d.mon start=cairo
 d.mon stop=cairo

 you will see a single pixel black line along both the right and bottom
 edges of the resulting map.png file. (trouble if you wanted to use

 crummy work-around is to make GRASS_WIDTH and HEIGHT one larger, then crop
 away the bad edges with pnmcrop.


Ticket URL: <https://trac.osgeo.org/grass/ticket/72#comment:22>
GRASS GIS <http://grass.osgeo.org>

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