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Color on the Web Community Group

Discussion forum between CSS experts, Color Management experts, and TV/Movie/Broadcast experts to explore use cases and inform W3C specification work (such as CSS Color 4 and subsequent levels). Both SDR and HDR are in scope. Wide gamut displays and the Web is in scope. Web use of ICC (v.4 and ICCMax) is in scope.

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Note: Community Groups are proposed and run by the community. Although W3C hosts these conversations, the groups do not necessarily represent the views of the W3C Membership or staff.

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Interest in TPAC meeting to discuss SDR/HDR compositing issues

Is there any interest in meeting to discuss use cases and issues involved in compositing a mix of SDR and HDR elements: images, graphics and video? Examples would include maintaining the color levels of sRGB elements when a HDR video begins playback, subtitle levels on HDR video, mixing of sRGB and HDR images on a page and css support for HDR.

I have requested the 15:30 to 17:30 time slot on Tuesday 7 November in the community group room at TPAC for a possible discussion session among interested parties. (Many time slots had already been allocated so I went ahead and secured one before the where gone.)

Paul Kerr


Welcome to the Color on the Web Community Group. It was created to allow color experts from various fields – traditional print-oriented color management, display experts, content creators from the TV, broadcast and film industries, CSS and graphics experts, and other interested parties – to come together, share ideas, use cases, experiences and discuss technical solutions to improve the state of Color on the Web.

Particular areas of interest include, but are not limited to:

  • Unambiguous, colorimetric color specification of desired presentation
  • Wide gamut colorspaces (wider than sRGB)
  • High dynamic range (greater range of luminance, darker blacks and peak whites greater than paper white)
  • Color matching between media (raster images, video, vector graphics) and text/styling content (styled by CSS)
  • Consistency and predictability of display