- From: Leif Arne Storset <lstorset@opera.com>
- Date: Wed, 27 Jul 2011 14:37:13 +0200
- To: "www-style@w3.org" <www-style@w3.org>
Alan Gresley <alan@css-class.com> skreiv Wed, 27 Jul 2011 12:52:34 +0200 > Regarding the recent CSS minutes and interpolation of gradients. [snip] >> 00:00:45 [fantasai] >> RESOLVED: Use premultiplied colors for gradients and transitions > > One way around the issue is that when keywords are used, the gradient > uses pre-multiplied space. If rgba() or hsla() are used, the gradient > uses un-premultiplied space. The same can happen with transitions for > color to color. I agree with Alan that the effects demonstrated at [0] are desirable, but premultiplied is a much better default. The switching idea is worth considering, however. I think use of the rgba() and hsla() are potentially confusing as switches, but an explicit 'unpremultiplied' switch wouldn't be: 'linear-gradient(left, unpremultiplied, rgba(255,255,0,0), yellow)'. It's worth noting that one can still use SVG for unpremultiplied gradients, so it's not impossible to achieve in any case. How easy we make it depends on how important we judge this use-case to be. In my view this is relatively rare (examples of use on the real Web would be welcome!) but it has a number of outspoken defenders and is cheap to support (given that all implementations support unpremultiplied from before and all will support premultiplied within a year). And I must say, many of the examples at [0] look very nice. I lean towards supporting this case using a switch. 0. http://css-class.com/test/temp/color-transparent.htm -- Leif Arne Storset Core Technology Developer, Opera Software Oslo, Norway
Received on Wednesday, 27 July 2011 12:37:44 UTC