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Why are semi-transparent GraphicsLayers not displaying transparency as expected after upgrading to the 9.3 .NET Web ADF?
Due to a bug in the 9.2 .NET Web ADF, in-memory GraphicsResources that use the default image format of PNG8 do not actually use the PNG8 format. The image format returned consists of PNG32 images using 24-bit RGB color and 8 additional bits for transparency.
This bug has been addressed for 9.3.
Due to this fix, the PNG32 format should now be used on graphics resources when using semi-transparent symbols on graphics layers. The default format of PNG8 only supports 1-bit transparency, meaning the image is fully transparent or fully opaque. PNG32 is the only image format that supports semi-transparency.
See the example below:
Semi-transparent fill symbol using PNG8 (left) and PNG32 (right)