Re: [compositing] linear-dodge (add) blend mode?

On Sat, Aug 4, 2012 at 8:22 PM, Marco Aurélio <thecoreh@gmail.com> wrote:

> Yeah. For some reason my message got stuck. I figured it was somehow
> lost so I sent it again. Sorry about that. There are now two entries
> for Wednesday on the archives, which is strange.
>
> Regarding the blending modes, perhaps we could have all the Photoshop
> modes that are missing? That would be 'linear dodge', 'linear burn',
> 'divide', 'linear light', 'pin light', 'vivid light', 'lighter color',
> 'darker color' and 'hard mix'. I personally would leave out 'dissolve'
> because frankly I've never seen anyone using it.
>

I can look into that.
Do you think this is high priority? Are could it wait until the next
revision?
I know that the open source browsers don't have support built in for those,
so it might take longer to implement.


>
> Another thing I think would be interesting: Blend modes that take in
> account pixels other than the one immediately "behind" the current
> pixel. For instance, having a "blur" blend mode where the luminosity
> of each pixel on the image determines a blur radius to be applied to
> the background. That would allow for interesting "tilt shift
> photography" effects, as well for stuff like the windows on Windows
> Vista/7.
>
> I'm not sure if implementing this would viable, specially on mobile
> hardware. But it might not be a problem since we already have stuff
> like the blur filter in place. Special care would also need to be
> taken to ensure all luminosity values take the same time to execute,
> as you pointed out on section 9 of the spec.


Yes.
It would be nice if we could create custom blenders and compositors but the
current driver architecture does not allow us to make this secure.
I think we can revisit this later...

Do you know of any software that is doing this?




> On Fri, Aug 3, 2012 at 2:57 PM, Rik Cabanier <cabanier@gmail.com> wrote:
> > Hi Marco,
> >
> > yes, this is the correct location. (For some reason your email didn't
> show
> > up in my inbox until now).
> >
> > We only added the blending modes that are in the PDF specification since
> > that is what the existing SVG Compositing spec had.
> > I have asked if people wanted to see more but didn't receive any feedback
> > apart from you. :-)
> >
> > Are there other blending modes that you would like to see?
> >
> > Rik
> >
> >
> > On Wed, Aug 1, 2012 at 9:59 AM, Marco Aurélio <thecoreh@gmail.com>
> wrote:
> >>
> >> Hi,
> >>
> >> I'm really excited about the Compositing and Blending spec, as this
> >> feature is something I've wanted in CSS for a very long time. Reading
> >> it, however, I noticed that a very common blend mode ("linear dodge",
> >> also known simply as "add") is missing. Even though the already
> >> included "screen" blend mode produces similar results visually, there
> >> are some interesting visual effects which are only possible or look
> >> better with the "add" blend mode.
> >>
> >> Is the "linear dodge"/"add" blend mode not present in the spec for
> >> some technical reason or specific design decision? If not, I would
> >> like to propose, as a suggestion, that it be included on the spec. I'm
> >> not at all familiar with the W3 specification process, so I'm not sure
> >> if this mailing list is the right place to propose a suggestion. If
> >> it's not the right place, how should I proceed?
> >>
> >> Thanks,
> >> -- Marco Aurélio
> >>
> >>
> >
>