[mapguide-trac] #743: AGG Renderer does not properly handle transparency for non-PNG image formats

[MapGuide Open Source]

#743: AGG Renderer does not properly handle transparency for non-PNG image
formats
---------------------------------+------------------------------------------
   Reporter:  gingerbbm          |       Owner:       
       Type:  enhancement        |      Status:  new  
   Priority:  medium             |   Milestone:       
  Component:  Rendering Service  |     Version:  2.2.0
   Severity:  minor              |    Keywords:       
External_id:                     |  
---------------------------------+------------------------------------------

Comment(by lgnemmi):

 GIF format can only supports binary transparency (one color is 100%
 transparent).

 PNG8 format supports binary transparency but also alpha transparency (ie
 50% transparent) as PNG format do

 My experiments gave that Mapguide can produce PNG8 and GIF overlay with
 100% transparency

 But is not able to produce PNG8 with 50% transparency.

 What i understand of the code you mention is that PNG8 is processed as GIF
 without alpha channel.

-- 
Ticket URL: <http://trac.osgeo.org/mapguide/ticket/743#comment:10>
MapGuide Open Source <http://mapguide.osgeo.org/>
MapGuide Open Source Internals