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Re: [filter-effects] negative std deviation on feGaussianBlur

From: Tab Atkins Jr. <jackalmage@gmail.com>
Date: Mon, 26 Aug 2013 09:37:00 -0700
Message-ID: <CAAWBYDB0Vuv_eM_xz+AgKEHiYj4L2q=9BiPiGgsriZhsZ7gWMA@mail.gmail.com>
To: Dirk Schulze <dschulze@adobe.com>
Cc: "public-fx@w3.org" <public-fx@w3.org>
On Mon, Aug 26, 2013 at 9:34 AM, Tab Atkins Jr. <jackalmage@gmail.com> wrote:
> On Mon, Aug 26, 2013 at 5:31 AM, Dirk Schulze <dschulze@adobe.com> wrote:
>> Hi,
>> The specification currently does not say what happens on negative standard deviation values for feGaussianBlur [1]. I suggest that it is not treated differently than a value of zero: the filter primitive does not have any effect on the input image, the input does not get blurred. I'll change the specification text to this suggestion.
>> Greetings,
>> Dirk
>> [1] http://www.w3.org/TR/filter-effects/#feGaussianBlurElement
> I agree with this change.

Note that I would disagree with this for blur() - a negative value
should be invalid at parse time.  We try not to do fixup in CSS, since
we have good fallback mechanisms.

Received on Monday, 26 August 2013 16:37:46 UTC

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