- From: Glenn Maynard <glenn@zewt.org>
- Date: Sat, 24 Nov 2012 09:59:26 -0600
- To: Rik Cabanier <cabanier@gmail.com>
- Cc: whatwg@whatwg.org, Ian Hickson <ian@hixie.ch>
On Fri, Nov 23, 2012 at 11:11 PM, Rik Cabanier <cabanier@gmail.com> wrote: > What matters is the shape that is used to calculate the blur (step 1) > In your example, that shape is a rectangle so just the rectangle edges will > be blurred. > That slightly blurred rectangle is then composited with the clipping region > in step 4. > > The end result is a solid rectangle in the shadowcolor that composites on > top of the shape. > Testing with Hixie's code (https://zewt.org/~glenn/canvas-glow.html), the output is very close to "inner shadow" in Photoshop (distance 0, size 22): https://zewt.org/~glenn/canvas-glow.png. (I'm testing against inner shadow instead of inner glow; inner glow seems to do something a little more complex at the blur step than a gaussian blur. Tested in Chrome 21; output in Firefox is different, but I probably need to update.) -- Glenn Maynard
Received on Saturday, 24 November 2012 17:08:05 UTC