Remove White Matte

[user_deleted]

I have a cg image rendered against a WHITE background with alpha, I normally take it to Photoshop using remove white matte to get rid of the fringe before composite against Background, what's the most appropriate way to do this in shake?

[deke-kincaid]

You have a white fringe because it's premultiplied. Just turn on the "premultiplied" radio button in the "over" node. You shouldn't have to paint anything in photoshop.

[user_deleted]

I think that premultiplied option in over node is only intended for black back grounds, because I still get a white fringe, anyway I find a macro on this site that does this called AEPremuilt.

P.S. I wasn't actually painting out anything in ps , just using the "remove white matte" command in PS, I do this for stills.