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

bugzilla-daemon at webkit.org bugzilla-daemon at webkit.org
Sat Mar 2 11:59:21 PST 2013


Florin Malita <fmalita at chromium.org> changed:

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--- Comment #6 from Florin Malita <fmalita at chromium.org>  2013-03-02 12:01:45 PST ---
(In reply to comment #4)
> Created an attachment (id=191036)
 --> (https://bugs.webkit.org/attachment.cgi?id=191036&action=review) [details]
> Screenshot using Pixie
> This screenshot shows the banding (alternation of darker and brighter bands) using Pixie. If SVG is supposed to replace flash such details count.

So the way I interpret this, the complaint in not strictly related to the presence of bands (they're unavoidable withing a discrete colorspace), but to their non-monotonic nature (lighter-darker-lighter instead of lighter-darker-darkerstill).

AFAICT the color component difference between adjacent bands is not larger than one (as expected), but the alternation is indeed non-monotonic: #565656 -> #575757 -> #565656 -> #555555 -> #545454 -> #555555.

> I expect a smooth gradient without such alternations.

That may be the root of the problem though: this is a Gaussian blur, not a gradient. I'm no feGaussianBlur expert, but your expectation may be unfounded.

I haven't tested IE and FF can't handle the samples, but Opera definitely implements feGaussianBlur similarly.

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