On Wed, Jun 13, 2012 at 10:03 AM, Larry Gritz <[email protected]> wrote:
> (Exercise for the reader: under what circumstances, and for which formats, > could you be SURE that a 4-channel image did not contain an alpha?) > A CMYK TIFF image? That's clearly a corner case, but I guess if I had two cmyk tiff images and tried to "over" them I would be sad if the tool ignored the TIFF reader saying "no alpha" and just assumed "K" was alpha. I don't think that's worth worrying about, but I just wanted to do the "exercise". :) I think there are CMYKA tiff images out there. It would probably be more commonly annoying if a reader didn't want to assume channel 3 was alpha, but it was and I just wanted the over to work with what is obviously (to me) RGBA images. Maybe it's better if the readers are more aggressive in identifying a alpha channel unless they are sure it's not? --jono
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