How-to Set Transparencies and Color Depth

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Originally Posted by DustyPorViva

but I think it may also adapt to web palette.

This, mostly.

Edit: Although, it looks like you can turn that off now. I know you couldn't in previous versions. But it's still GIF. PNG is preferred. Not too bad anymore, but still not the best way to do it. Also, saving with IrfanView, you can also use pngout, which it comes with. Saving with pngout will (sometime drastically) reduce the size of the resulting file, which is great for both website usage and Graal.