Re: [css3-images] Premultiplication switch (was: gradient pre-multiplied interpolation)

On Jul 28, 2011, at 3:06 AM, "Leif Arne Storset" <lstorset@opera.com> wrote:

> Brad Kemper <brad.kemper@gmail.com> skreiv Thu, 28 Jul 2011 01:49:14 +0200
> 
>> On Jul 27, 2011, at 2:53 PM, Brian Manthos <brianman@microsoft.com> wrote:
>> 
>>> I meant an example usage, but that's good enough for now.
>>> 
>>> I'd rather see the interpolation specified in the gradient specification itself.
>>> 
>>> Doing it as part of the gradient itself would allow for varying the interpolation mode across layers of a background-image specification, whereas doing it as a separate property wouldn't allow that.  Unless of course you want to make color-interpolation a layered property as well...
>> 
>> That strikes me as a very good point. An author who who wants this level of control over whether or not to premultiply might also want to control it on a background layer by background layer basis.
> 
> Then again, if the author knows enough about premultiplication to care, he or she (or the editor) is probably knowledgeable enough to just code everything unpremultiplied. (As I far as I can see premultiplying is only done so authors can use the intuitive "transparent" keyword - it doesn't enable any additional effects.)

Another problem is that if the pre-multiplication switch is per-gradient then you couldn't do an animation or transition between two gradients with that switch set differently, right? But if it is per-element, then you don't have that problem.