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gradualepiphany

Composite COP & Alpha

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I've found an odd bug using the over function inside of the Composite cop - I've got Image A over Image B - A has an alpha channel, B's alpha is completely white. Even if I HSV or Bright A's alpha down to complete black, A will still be about 60% visable.

Any ideas?

thanks,

|andrew|

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Yup i'm getting it too (175,linux), you should post this at SESI, they'll want to know about it.

Same with the Layer cop

EDIT: Works fine if you leave all 4 plane scope buttons toggled "on" and type "A" explicitly in the field next to it instead of * . Still not sure if this a bug or intentional, don't remember it being like this before, Can someone confirm

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Try adding a premultiply cop after you bring the alpha down. I think most compositors function that way if the A image isn't properly premultiplied.

Cheers,

Jens

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