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 ::



3 thoughts on “Premultiplied vs Straight”

  1. 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.

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