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Re: [css3-background] Where we are with Blur value discussion

From: Aryeh Gregor <Simetrical+w3c@gmail.com>
Date: Fri, 16 Jul 2010 18:15:55 -0400
Message-ID: <AANLkTilEwnw0l-7fZXYQLEWD3fVccY_0z13ML3rqUAYe@mail.gmail.com>
To: Sylvain Galineau <sylvaing@microsoft.com>
Cc: "Tab Atkins Jr." <jackalmage@gmail.com>, "L. David Baron" <dbaron@dbaron.org>, Brad Kemper <brad.kemper@gmail.com>, Simon Fraser <smfr@me.com>, Brendan Kenny <bckenny@gmail.com>, www-style list <www-style@w3.org>
On Thu, Jul 15, 2010 at 7:53 PM, Sylvain Galineau
<sylvaing@microsoft.com> wrote:
> Check, thanks. Then I'm not sure I understand how Aryeh knows Opera is correct. Note that I'm
> not saying he's wrong; I'm saying *I* don't get it :)

Because they both clearly define things in terms of Gaussian blurs,
just they treat the input differently.  SVG just treats it as an exact
number of standard deviations, while canvas halves it if it's 8 or
less, otherwise takes the square root of twice the number provided.
So a blur in SVG of 5 is the same as a blur in canvas of 12.5, since 5
= sqrt(2*12.5).
Received on Friday, 16 July 2010 22:16:22 UTC

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