Re: [css-compositing] "add" and "subtract" blend modes

On Thu, Aug 23, 2012 at 5:32 PM, Shawn Allen <> wrote:

> Hi Rik,
> To be blunt, a compositing spec that excludes "add" or "subtract" feels
> incomplete to me, as those are two of the mathematically simplest
> operations.

I don't believe there is a blend mode that does a "subtract". Are you maybe
thinking of "difference"?


But maybe that's just because I've had creative needs for both of them and
> got really excited about not having to do them in canvas or WebGL again
> when I saw the WD. :)
> So yes, I do feel strongly that they should be in the first spec. Do the
> open source browsers have support for all of the other modes already?

I just checked and both WebKit and Mozilla have the modes from the current
spec built-in but none of the Photoshop ones.

> On Aug 23, 2012, at 10:55 AM, Rik Cabanier wrote:
> > thanks for your feedback!
> > Do you feel strongly that these blend modes should be in the first
> specification, or do you think they could wait until the next version?
> >
> > Looking at the open source browsers, there is no support under the hood
> for these Photoshop specific blend modes which might slow down
> implementation.

Received on Friday, 24 August 2012 04:38:49 UTC