Display of PNG images with alpha transparency

We extensively use PNG images with transparency (using alpha channel).  I've managed to successfully load and save these images using LEADTOOLS with the alpha information preserved; however, I can't figure out how to get the RasterImageViewer to display them correctly without modifying the image data.

Is there some way to inform the viewer that it should interpret the alpha channel as transparency data, in accordance with the PNG specification?

Thank you,
Ben

What is the file version of Leadtools.dll that you are using?

In 16.5, we added the ability for the RasterImageViewer to automatically do alpha channel painting.  To do this, you need to set the RasterPaintProperties.PaintEngine to RasterPaintEngine.GdiPlus.

If you're using 15 or older, you need to create a background image of the color you want for the background, then use the FeatherAlphaBlendCommand to paint the image with alpha transparency.

Great; the GdiPlus PaintEngine works like a charm.

Thank you,
Ben.