- From: Brad Kemper <brad.kemper@gmail.com>
- Date: Mon, 4 Feb 2013 20:52:39 -0800
- To: Alan Gresley <alan@css-class.com>
- Cc: Simon Fraser <smfr@me.com>, Rik Cabanier <cabanier@gmail.com>, fantasai <fantasai.lists@inkedblade.net>, "www-style@w3.org" <www-style@w3.org>
On Feb 4, 2013, at 8:03 PM, Alan Gresley <alan@css-class.com> wrote: > On 5/02/2013 2:53 PM, Alan Gresley wrote: > >> Brad. I'm just wondering what type of background you plan to use under >> any gradient with alpha transparency? >> >> A pre-multiplied gradient of yellow to transparent to blue is identical >> to a non pre-multiplied gradient of yellow to transparent-white to blue >> when composite on a white background. There is _no need_ for an extra >> color stop. > > Wrong and correction. A pre-multiplied gradient of yellow to transparent to blue compiste of a whitye background is identical to a gradient of yellow to white to blue (fully opaque). > > What do you want to achieve with a gradient that has alpha transparency and have you tested any of this by observing the difference between pre-multiplied colorspace and non pre-multiplied colorspace? As I recall, last time I had a problem with the way Safari does gradients, it was a solid color to transparent, and the stuff underneath it was variable, some white, some other colors. I just wanted the color to fade to transparent over the varied background, but instead it looked dirtier as it faded out.
Received on Tuesday, 5 February 2013 04:53:11 UTC