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Re: [csswg-drafts] [css-color] DCI P3 transfer function

From: Chris Lilley via GitHub <sysbot+gh@w3.org>
Date: Sun, 24 Jul 2016 00:22:32 +0000
To: public-css-archive@w3.org
Message-ID: <issue_comment.created-234748814-1469319750-sysbot+gh@w3.org>
1/2.6 is appropriate for a totally black viewing environment. For the 
web, a 1/2.2 (or sRGB) transfer curve is more appropriate for typical 
viewing conditions.

> Typically, the deciding factor is based on the general ambiance of 
the room. A darker room requires a higher power (the reason why cinema
 projections in a completely dark room use gamma 2.6). A good rule is 
to use a value around 2.0 for daylight uncontrolled lighting, 2.2 for 
dim lighting, 2.35-2.4 for a dark controlled room, and 2.5-2.6 for 
pitch black.
David Torciva

Since graphics cards have hardware support for the sRGB transfer curve
 (whose overall gamma is close to a 2.2 curve), I wonder if we can 
specify the DCI-P3 primaries and whitepoint and the sRGB transfer 
curve. Rec 2020 also uses an sRGB-like curve, with a linear portion 
near black, except with higher precision to cope with 10bit or 12bit 
per component displays.

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Received on Sunday, 24 July 2016 00:22:41 UTC

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