Recently working on some green screen footage I’ve got a lot of artifacts in it so I decided to fix them manually in Photoshop. I’ve exported footage as TIFF sequence from AE (both AE and PS are CS3), RGB+Alpha, Millions+ etc., and after I imported sequence in PS I found there is no alpha at all, neither premultiplied nor straight. But if I open every single frame separately it does contain an alpha channel. Looks like Photoshop does not recognize alpha channels in image sequences? At least for TIFF. For now solution was to export as QT with animation codec, there was no problem with alpha. But for future and general information: is it known problem? Is there any solution or may be I was doing something wrong?