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
Is this supported by the GIMP?
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