Posted by Demoscene Passivist on Jul 29, 2012; 7:52pm
URL: https://forum.jogamp.org/Premultiplied-Textures-tp4025659p4025694.html

"premultiplied alpha" generally means that a constant color (e.g. the background color) is mixed with the normal RGB values of the pixel beforehand. The amount of mix is determined by the value of the alphachannel.

Its generally regarded as a compatibility fallback method for uses where translucency is not available.

Nowadays I would generally discourage using premultiplied alpha and use "real" direct alpha which (at least from my experience) works flawlessly with jogl.

Maybe you could elaborate a little bit more on your problem as I doubt that the blending modes do not work correctly. Maybe the problem is application specific on your side ?