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

From: Marco Aurélio <thecoreh@gmail.com>
Date: Sun, 5 Aug 2012 00:22:02 -0300
Message-ID: <CAHqCb+d06x1VS178pj_ZEcmhFezQkV+=Orp+F3JYNWVFXooQaQ@mail.gmail.com>
To: Rik Cabanier <cabanier@gmail.com>
Cc: public-fx@w3.org
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.

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

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.

-- Marco

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
Received on Sunday, 5 August 2012 03:22:52 UTC

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