AFAIK, the PNG file format supports two kinds of transparency: variable transparency(alpha channel) and binary transparency. I know how to add an alpha channel to the image and manipulate it, but what I'm asking about is the binary transparency, there should be a method to choose a color that will be the transparent color(like GIF's), I know I can use the alpha channel to simulate this(using Select By Color or something), but I want it to be saved to the PNG file as a transparent color.
Is this supported by the GIMP?

thanks much.

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