On Fri, Nov 23, 2012 at 11:11 PM, Rik Cabanier <caban...@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