[Webkit-unassigned] [Bug 111177] feGaussianBlur shows banding under certain circumstances

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=111177





--- Comment #10 from Stephen White <senorblanco at chromium.org>  2013-03-03 10:33:44 PST ---
I'm pretty sure this is caused not by the gaussian blur per se, but by the lookup tables used to apply gamma conversion after filter application.

If you try applying color-interpolation-filters="sRGB" to the filters (both the morphology and the blur), it will skip the LUT step, which should reduce the banding.  The results may not be mathematically correct, but the visual result is a lot better in many cases.

(As to why WebKit's generic LUT application introduces banding while Safari's CoreGraphics implementation does not, I'm not sure.)

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