[mapserver-users] Raster layers with partial transparency

[Chris Hodgson]

Just a guess but have you tried with transparent = 0? Just wondering if 
the transparent mode rendering is somehow overriding the RGBA alpha mode 
rendering?

Chris

Jason Beverage wrote:
> Hi all,
>
> I'm serving up some raster imagery with an alpha band that contains 
> partially transparent pixels using mapscript but when the image is 
> rendered, the partially transparent portions (alpha between 5 and 10) 
> come through completely opaque (alpha of 255).  Areas that are fully 
> opaque or fully transparent look fine. 
>
> I'm using an output format with the GD/PNG renderer with a RGBA image 
> mode and "transparent" set to true.  I've tried using the AGG/PNG and 
> GDAL/PNG renderers with the same result.
>
> C# code for the output format:
> map.outputformat.name <http://map.outputformat.name> = "PNG";
> map.outputformat.driver = "GD/PNG";
> map.outputformat.mimetype = "image/png";
> map.outputformat.imagemode = (int)MS_IMAGEMODE.MS_IMAGEMODE_RGBA;
> map.outputformat.extension = "png";
> map.outputformat.transparent = 1;
>
> Any ideas on what I'm doing wrong?
>
> Thanks,
>
> Jason
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