[mapserver-users] Average/Bilinear Resampling and Alpha Bands

Jason Beverage jasonbeverage at gmail.com
Mon Mar 15 11:53:25 EDT 2010

Hi all,

I have some imagery that is in UTM that contains an alpha band that
masks out areas with no data.  When I use MapServer to reproject it to
epsg:4326, the masked out area looks good if I set RESAMPLE=NEAREST on
the layer.  If I change the RESAMPLE option to BILINEAR or AVERAGE I
get black splotches in the area that is transparent.

Has anyone else seen this behavior?

I'm using MapServer 5.6.1



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