- From: David Dailey <ddailey@zoominternet.net>
- Date: Tue, 23 Jul 2013 20:18:35 -0400
- To: "'Rik Cabanier'" <cabanier@gmail.com>, <whatwg@whatwg.org>
Hi Rik, Just affirming what you've said in SVG: http://cs.sru.edu/~ddailey/svg/edgeblurs.svg The middle rects are crisp, having been merely translated leftward and downward by half a pixel. Zooming in from the browser rectifies the problem (as expected) after a single tick. I remember folks discussing sub-pixel antialiasing quite a bit on the SVG lists circa fall/winter 2011. It seemed to cause some troubles for D3. Is that the same issue? Cheers David -----Original Message----- From: whatwg-bounces@lists.whatwg.org [mailto:whatwg-bounces@lists.whatwg.org] On Behalf Of Rik Cabanier Sent: Tuesday, July 23, 2013 7:19 PM To: whatwg@whatwg.org Subject: [whatwg] Blurry lines in 2D Canvas (and SVG) All, we've noticed that if you draw lines in canvas or SVG, they always end up blurry. For instance see this fiddle: http://jsfiddle.net/V92Gn/128/ This happens because you offset 1 pixel and then draw a half pixel stroke on each side. Since it covers only half the pixel, the color gets mapped to 50% gray. You can work around this by doing an extra offset of half the devicepixelratio, but ideally this should never happen. Is this behavior specified somewhere? Is there a way to turn this off?
Received on Wednesday, 24 July 2013 00:19:12 UTC