artemp/trac2github — Issue #590: RasterSymbolizer doesnt down-blend semi-transparent rasters in output
Author: artemp
Created: 2011-10-09 20:42:20+00:00
State: open
Labels: Core_Library

* create a map with an opaque background
* load a semitransparent PNG using gdal plugin
* render the map

My output shows the opaque background being overwritten by (not blended with) by the raster (although completely transparent areas do get masked away)

I'll attach my python test case and my input/output images.

I'm using mapnik 0.7.1.