- From: Chris Lilley <chris@w3.org>
- Date: Fri, 22 Oct 2010 20:56:16 +0200
- To: Dirk Schulze <vbs85@gmx.de>
- CC: www-svg@w3.org
On Friday, October 22, 2010, 1:33:53 PM, Dirk wrote: DS> Hi folks, DS> I was looking at painting-render-02-b.html recently and I am a bit confused. DS> The tests should test the correct handling of DS> color-interpolation. Different rects have different properties of DS> color-interpolation: auto, sRGB, linearRGB and inherit. DS> But my understanding was that color-interpolation (or DS> transforming sRGB colors to linearRGB colors and back) just DS> influence the channels red, green and blue. Yes. On both the source and the background. DS> The rects on the test, with the different color-interpolations, DS> are filled with the color 'white'. According to the algorithm on DS> [1], the color spaces linearRGB and sRGB provide the same color DS> values. Both results are 255,255,255, independent if you transform DS> sRGB to linearRGB or back. So why should we see a difference between the rects? See 14.2 Simple alpha compositing http://www.w3.org/TR/SVG/masking.html#SimpleAlphaBlending the white, semiopaque rects are being composited onto rectangles filled with either #7F7F7F or #BBBBBB and the result will differ depending on the color-interpolation value. -- Chris Lilley Technical Director, Interaction Domain W3C Graphics Activity Lead, Fonts Activity Lead Co-Chair, W3C Hypertext CG Member, CSS, WebFonts, SVG Working Groups
Received on Sunday, 24 October 2010 14:18:29 UTC