[webkit-help] Canvas rendering should be done in linear color space (gamma 1) and the result displayed in sRGB color space (approximately gamma 2.2)

[Simon Fraser]

A good start would be to file a bug at bugs.webkit.org for this issue.

Simon

On May 24, 2011, at 11:59 AM, Hugues De Keyzer wrote:

> Hi all,
> 
> For the moment, it seems that drawing on canvas is done without
> accounting for gamma, actually making wrong assumptions, like a^x +
> b^x = (a + b)^x. This gives incorrect results, although they are not
> always obvious to perceive. For example, all shapes and font
> antialiasing is incorrect, as are gradients. I propose to address this
> issue by ensuring that all drawing operations are done in linear
> space.
> 
> I wrote a thorough explanation in a W3C bug report, so please see
> http://www.w3.org/Bugs/Public/show_bug.cgi?id=12444 for more
> information. As a picture is often more expressive than text, please
> take a look at the example picture:
> http://www.w3.org/Bugs/Public/attachment.cgi?id=975 (has to be
> displayed unscaled).
> 
> I don’t know whether this is the appropriate mailing list to present
> this problem. The actual drawing is probably done through
> platform-specific libraries, so maybe this issue concerns those? If it
> is the case, could someone give me a list of these platform-specific
> libraries?
> 
> Kind regards,
> 
> Hugues De Keyzer
> 
> La sola konstanto en la vivo estas la ŝanĝo.
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