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convert to png or psd ?
Thanks Wolfgang, but I have a work flow that makes LARGE numbers of TIFFs. I'm frustrated because it worked fine in D10. It's a D11 regression.
how are you using these alpha channels? Through scripting?
The alpha channel is part of the TIFF -- it's RGBA -- an image with built-in transparency, not a separate mask, imported as a 32bits/pixel image.
The bug is localized because things work correctly on XP and work correctly with a D10 projector on a PowerPC/Mac. They fail to work from a D11 projector for the PowerPC/Mac. I don't yet have an Intel/Mac to check the remaining possibility.