- From: Brendan Kenny <bckenny@gmail.com>
- Date: Tue, 13 Jul 2010 16:55:06 -0500
- To: "L. David Baron" <dbaron@dbaron.org>
- Cc: Brad Kemper <brad.kemper@gmail.com>, www-style list <www-style@w3.org>, fantasai <fantasai.lists@inkedblade.net>, Brian Manthos <brianman@microsoft.com>, Simon Fraser <smfr@me.com>
On Tue, Jul 13, 2010 at 3:21 PM, L. David Baron <dbaron@dbaron.org> wrote: > On Tuesday 2010-07-13 07:15 -0700, Brad Kemper wrote: >> Arguments in favor of the distance measuring the Entire blur region width (current spec language): >> >> 1) The entire perimeter is blurred, outer and inner, not just >> outer, so it is logical that the width of the entire blur effect >> width should match the authored value. > > However, for 'text-shadow' the value is called the "blur radius", > not the "blur diameter" (and has been called "blur radius" since > http://www.w3.org/TR/1998/REC-CSS2-19980512/text.html#text-shadow-props ). > > (I'm not sure when the definition of 'box-shadow' changed from using > the commonly-used term "blur radius" to using the new term "blur > distance".) > > I'd also note that blurring is implemented as a generic > transformation of images; it's not just something applied to edges. > In that form, I think measuring in terms of the radius > (approximating the concept of how far away from its original > location can the color of a point can get) makes more sense than > using the diameter (approximating the distance between the two > farthest points in opposite directions that the color of a pixel can > reach). > > So I also favor switching the definition of box-shadow to match > text-shadow and to describe a blur radius rather than a diameter. > > -David > > -- > L. David Baron http://dbaron.org/ > Mozilla Corporation http://www.mozilla.com/ "blur distance" was added very recently, I think just a few messages before it was realized that the change would be an issue: http://dev.w3.org/cvsweb/csswg/css3-background/Overview.src.html.diff?r1=1.232&r2=1.233&f=h "blur radius" had been replaced with "blur value" the revision before that.
Received on Tuesday, 13 July 2010 21:55:43 UTC