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Spec anomaly - opacity

From: Sean Hayes <Sean.Hayes@microsoft.com>
Date: Mon, 8 Dec 2008 23:05:07 +0000
To: "public-tt@w3.org" <public-tt@w3.org>
Message-ID: <90EEC9D914694641A8358AA190DACB3D2FCE9A26F3@EA-EXMSG-C334.europe.corp.microsoft.com>

I notice that opacity is specified as a float value, implying an inordinate (and completely untestable) set of gradations of alpha; while colour alpha is specified as only 255 steps. This seems completely skewed to me.

I would recommend that we align opacity and colour alpha by specifying <alpha> expressions as component-value.

Whether we wish also to anticipate 16bit colour is a separate question we probably ought to look at.

Sean Hayes
Media Accessibility Strategist
Accessibility Business Unit

Office:  +44 118 909 5867,
Mobile: +44 7875 091385
Received on Monday, 8 December 2008 23:06:48 UTC

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