Re: [css3-background] blending on 'box-shadow' and 'text-shadow'

On Tue, Apr 10, 2012 at 5:51 PM, Lea Verou <leaverou@gmail.com> wrote:

>  I think this problem should be solved more generically, rather than
> adding keywords to random properties. For example, the `difference`
> blending mode could be used on text color to make it more legible
> regardless of background. Or, blending modes on borders and/or backgrounds
> could produce quite interesting effects.
>

That's what I'm trying to do. See an early draft here:
https://dvcs.w3.org/hg/FXTF/rawfile/tip/compositing/index.html
Shadows are unique in that people generally want to blend the shadow but
not the element itself. I'm not sure how you cold change the shadow apart
from adding a keyword to the box-/text-shadow attribute.


> They could also replace the `invert` keyword on `outline`.
>
Maybe a function that can be used in place of any <color> value?
>

I'm not sure if I understand. Can you elaborate?


>
>
> Lea Verou (http://lea.verou.me | @LeaVerou)
>
>
> On 10/4/12 15:52, Rik Cabanier wrote:
>
> All,
>
>  I'm currently working on the blending specification (
> http://blogs.adobe.com/webplatform/2012/04/04/bringing-blending-to-the-web/)
> and someone brought up that a very common use case for blending is drop
> shadows.
> Some of our applications such as Photoshop, Illustrator and InDesign set
> the shadow to multiply by default since it provides a more pleasing
> appearance that can't be done with simple alpha blending. See
> http://css-tricks.com/dont-use-black-for-shadows/ for a discussion on why
> this is.
>
>  Would there be interest in an additional keyword to specify blending to
> 'box-shadow' or 'text-shadow'?
> the syntax could look like:
>
> box-shadow: 64px 64px 12px 40px rgba(0,0,0,0.4) multiply
>
>
>  Rik
>
>