10Sep/113
Premultiplied vs Straight
As I was researching about the differences between these two color modes, I've noticed how many people have difficulty about it, most working with it everyday. So as a form of self study I made the following diagram.
{In a nut shell, when you have transparency in the Straight mode, only the alpha channel is affected, the RGB remains the same, pure; with Premultiplied, the RGB channels get multiplied by the background color, which most cases is black. The alpha channel of both are exactly the same.}
Click for a bigger version. Hope it helps.
September 10th, 2011 - 16:45
Muito legal schiffer!
September 12th, 2011 - 11:00
ou seja, o straight é bom pra usar em BGs fora de foco e o premult eh bom pra usar nos personagens?
September 12th, 2011 - 12:04
Henry, na verdade tanto faz qual dos dois usar, vc terá o mesmo resultado portanto que o programa interprete corretamente. Dá para reparar nisso na última tabela, no fundo cinza.
agora, renders 3d sempre saem em premultiplied, pela natureza deles.