[webkit-dev] canvas and sRGB

Simon Fraser simon.fraser at apple.com
Mon May 2 13:58:54 PDT 2016

> On May 2, 2016, at 1:45 PM, Rik Cabanier <cabanier at gmail.com> wrote:
> All,
> with the release of DCI-P3 screen, WebKit began supporting the display of high gamut images.
> Specifically, if you have an image with a DCI-P3 profile, its pixels render untouched on the new displays.
> However, if you try do do any sort of canvas manipulation, you will see that the colors are being compressed to sRGB and you will lose the depth of the color.
> Was it an oversight to always create the canvas imagebuffer in sRGB? [1]

No, this was a deliberate choice. We can't change author expectations for what getImageData() return.

> If this is as-designed, how can we work around this limitation?

With possible future enhancements to the canvas spec that allow authors to request backing store with a different format and/or color profile.
> PS
> I asked the same question on WhatWG. [2]
> 1: https://github.com/WebKit/webkit/blob/112c663463807e8676765cb7a006d415c372f447/Source/WebCore/platform/graphics/ImageBuffer.h#L73 <https://github.com/WebKit/webkit/blob/112c663463807e8676765cb7a006d415c372f447/Source/WebCore/platform/graphics/ImageBuffer.h#L73>
> 2: https://lists.w3.org/Archives/Public/public-whatwg-archive/2016Apr/0036.html <https://lists.w3.org/Archives/Public/public-whatwg-archive/2016Apr/0036.html>

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