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February 2001
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2001.02.21 19:57 "Re: PhotoShop alpha channels and LibTiff", by Chris Hanson
I've seen this too, if I created the Alpha channel in Photoshop.
If I create a 32-bit (24-bit + 8 bit alpha) TGA image in another
program, and load it into Photoshop, Photoshop shows it as RGBA.
If I then save it to TIFF, Photoshop properly flags it as an Alpha
channel, and TIFFReadRGBAImage reads it fine. I'm not sure what
Photoshop does differently when you create an Alpha channel by hand
versus loading it with the image.
I have no advice, but I'd be interested in the answer myself.
Chris - Xenon
--
Chris Hanson | Xenon@3DNature.com | I've got friends in low latitudes!
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