On Wed, Jun 13, 2012 at 2:28 PM, Larry Gritz <[email protected]> wrote:

> 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?
>

That's what I meant. I'd be annoyed if the CMYK over didn't work, but I'd
probably be more often annoyed if the un-tagged RGBA image didn't work. The
latter is far more likely. However, it feels icky because in the latter
case, I can fix the problem by tagging the image. In the former case my
image is properly tagged and there is nothing I can do as a user to make
the software work.

I do think this is more elegantly solved by letting the readers indicate
either "I know there is no alpha channel" or "I don't know what these
channels mean - feel free to guess".

--jono
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