You think? What are the relative probabilities of somebody asking you to composite two CMYK images (or even *ever* seeing a CMYK image in the kind of environment where somebody would be tempted to use "over"), versus being handed an RGBA image that lacks the correct "TIFFExtraSamples" tag?
On Jun 13, 2012, at 2:18 PM, Jonathan Gibbs wrote: > 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 > > > _______________________________________________ > Oiio-dev mailing list > [email protected] > http://lists.openimageio.org/listinfo.cgi/oiio-dev-openimageio.org -- Larry Gritz [email protected]
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