[Bug 11431] should mention that .toDataURL() for image/jpeg acts as if the image was composited against black

http://www.w3.org/Bugs/Public/show_bug.cgi?id=11431

--- Comment #4 from Philip Taylor <excors@gmail.com> 2010-12-04 23:48:47 UTC ---
Trying http://philip.html5.org/demos/canvas/jpeg-alpha.html with some variously
old browsers:

Firefox (3.6): returns (r, g, b, 1).
Opera (10.60): returns (r, g, b, 1).
IE9 (some not-quite-latest preview): blends with black.
Safari (4.03 Win): blends with white.
Chrome (8.0 Win): doesn't support JPEG.

Doesn't look like there's really any convergence on one behaviour, so I'd guess
the spec should define whatever seems the most sensible behaviour and then hope
they converge in that direction.

(I don't know what's really the most sensible behaviour, but what the spec says
sounds plausible to me.)

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Received on Saturday, 4 December 2010 23:48:49 UTC