[cairo] Color, Cairo and Cups

Russell Shaw rjshaw at netspace.net.au
Wed Mar 8 17:43:55 PST 2006

Billy Biggs wrote:
> Larry Ewing (lewing at gnome.org):
>>On Wed, 2006-03-08 at 18:13 -0500, Behdad Esfahbod wrote:
>>>On Wed, 8 Mar 2006, Larry Ewing wrote:
>>>>Additionally if you ignore gamma (which Cairo does anyway
>>>>right?) the working space doesn't matter too much for many
>>>It does matter for any operation involving color blending, like
>>>all operations with non-opaque alpha, and all with antialiasing
>>To clarify I was talking mainly about other RGB spaces here, not wildy
>>different ones.
>   The problem is that Cairo currently deals with sRGB (gamma-corrected)
> values, and compositing in a gamma-corrected colour space is wrong
> and leads to artifacts.  This problem is known but fixing it is hard
> (read: slow, and most other software also gets it wrong).

It's really insane to make the data non-linear for anything other than
at the final output to a display device, or to linearize the input from
an input device.

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