On Fri, May 16, 2014 at 5:42 PM, Rik Cabanier <caban...@gmail.com> wrote:

> Is the Web page not composited in sRGB? If so, it seems the backing store
> should be sRGB too.

The web page is not composited in sRGB. It is composited in the output
device's color space, which is often sRGB or close to sRGB, but not always.
A notable significant exception is pre Snow Leopard Macs that use a gamma
1.8 transfer curve.
By the way, sniffing the display color profile through getImageData is a
known fingerprinting technique. This factor alone can be sufficient to
fingerprint a user who has a calibrated monitor.

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