Re: Updated filters specification

Hi Robert,

can you show me an example where this is used?
As was stated before in this thread, the effect of 'enable-background' could
be emulated by just rearranging the content.

"filtering" 2 images together really sounds like blending to me and as such
should go into the blending spec. If that spec is not able to produce this
effect (and you believe that this is a required feature) then the future CSS
compositing specification should address it.


On Wed, Apr 27, 2011 at 10:24 PM, Robert O'Callahan <>wrote:

> On Thu, Apr 28, 2011 at 5:22 AM, Rik Cabanier <> wrote:
>> It seems that when you access the background, you start to do blending.
>> Can't we move the functionality of BackgroundImage and BackgroundAlpha to
>> the CSS compositing spec?
>> In SVG today, it seem like overlapping functionality that should be fixed.
> No, exposing BackgroundImage and BackgroundAlpha to filters enables all
> kinds of effects that can't be reduced to compositing operators. (E.g.,
> blurring or displacement mapping of the background.)
> Rob
> --
> "Now the Bereans were of more noble character than the Thessalonians, for
> they received the message with great eagerness and examined the Scriptures
> every day to see if what Paul said was true." [Acts 17:11]

Received on Thursday, 28 April 2011 18:11:56 UTC