I can't find a way to apply certain simple effects to a png with transparency. If I do, the effect gets applied to the whole background.
Take this image to test with :
If I take two copies and try to invert one I get this:
If I then try to lighten the other I get this:
It is not all effects but Invert, Contrast and Hue Saturation affect the background or just treat the alpha as black. Incidentally, Invert, Contrast and Colour FFGL effects seem to respect the alpha more in line with expectations but now that I'm trying to go completely 64bit FFGL is not (currently) an option.
Respecting alpha
Re: Respecting alpha
The issue here is premultiplied alpha vs. non-premultiplied alpha. But I can look into adding an option to handle it better.
Re: Respecting alpha
I guess I should have searched more thoroughly viewtopic.php?f=2&t=355&hilit=premultiplied
But worthy of a bump, no? Thanks Eric.
But worthy of a bump, no? Thanks Eric.
Re: Respecting alpha
Ah yes. Thanks.