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Re: [CSS21] Test Suite

From: Chris Lilley <chris@w3.org>
Date: Thu, 22 Jul 2004 23:05:00 +0200
Message-ID: <679698839.20040722230500@w3.org>
To: "Brian Sexton" <discussion-w3c@ididnotoptin.com>
Cc: lachlan.hunt@lachy.id.au, "Mark Moore" <mark.moore@notlimited.com>, www-style@w3.org

On Thursday, July 22, 2004, 3:41:49 AM, Brian wrote:

>>    IE does support PNG, except for alpha transparancy.

BS> I do not know if it matters for the test suite in question, but IE also
BS> handles gamma correction differently than other browsers.  For example, a
BS> fully opaque PNG image may differ from the CSS-specified color of a
BS> surrounding page.

BS> I do not know all of the details off the top of my head, but here is a page
BS> that seems to give a decent overview of the issue:

Yes. This is a known IE bug. I seems to relate to the handling of the
sRGB chunk, which if present causes the precise sRGB transfer curve and
flare correction to be applied while colors in CSS (which are also
defined in sRGB) have a different (unity) correction.

BS> http://www.hut.fi/u/hsivonen/png-gamma.html

 Chris Lilley                    mailto:chris@w3.org
 Chair, W3C SVG Working Group
 Member, W3C Technical Architecture Group
Received on Thursday, 22 July 2004 17:05:00 UTC

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