[Bf-committers] Soft Light, Linear Light blend modes updated, Darken mode fixed

[Vilem Novak]

I tested this in blender, and was indeed surprised that it didn't work well. 
In the bug description of gimp there's the 8 bit processing blamed along with HSV model,
and I thought blender's float compositing would be much better. 
here is the result from the gimp bug description, done in blenders compositor:

http://plant.ffa.vutbr.cz/~novak/dwnflz/doggie.tga

It's better than gimp, but still much worse than photoshop.


> ------------ Původní zpráva ------------
> Od: Reuben Martin <reuben.m at gmail.com>
> Předmět: Re: [Bf-committers] Soft Light, Linear Light blend modes updated,
> Darken mode fixed
> Datum: 27.8.2009 01:50:56
> ----------------------------------------
> While on the topic of color modes, I found it an interesting read on
> the Gimp dev list about how they are changing the Hue, Saturation and
> Value mixing modes from HSV / HSL color model to CIE LCH.
> 
> I tested out the mixing modes in blenders compositor and it has the
> same type of "bug" as described in the Gimp mailing list.
> 
> Supposedly this better matches how photoshop does it's color mixing,
> as well as some other nice compositors I imagine.
> 
> So the questions is, would it be a good thing for Blender to do the same?
> 
> The discussion thread starts here:
> http://www.mail-archive.com/gimp-developer%40lists.xcf.berkeley.edu/msg18384.html
> 
> And the Gimp bug is filed here:
> http://bugzilla.gnome.org/show_bug.cgi?id=325564
> 
> -Reuben
> 
> 
> On Wed, Aug 26, 2009 at 6:40 AM, Roland Hess<rolandh at reed-witting.com> wrote:
> > I've updated my patch that adds Soft Light and Linear Light blending
> > modes, as well as fixes the buggy fading behavior of Darken mode to work
> > with 2.5.
> >
> > Quick refresher: Soft Light is superb for color grading stills and
> > animation through the compositor. Linear Light is essential for doing
> > effects that rely on a High Pass-style filter. When using darken mode,
> > either in material blending or in the compositor, blend values of less
> > than 100% tended to go toward complete black (0,0,0) because of how and
> > where the percentage was applied during the process. That was incorrect.
> > It has been fixed to operate in line with expected behavior.
> >
> > Demonstration of Soft Light color grading available at:
> > http://www.harkyman.com/2008/08/21/new-compositor-mix-types/
> >
> > Not sure who is in charge of blending mode code maintenance these days,
> > but this patch is very very simple, and the artistic use is already
> > known to anyone who's worked in Photoshop or AfterEffects. I'd hate to
> > see all of the wacky stuff show up in 2.5 and have this one fall by the
> > wayside for another release cycle. Take you five minutes to look at the
> > patch or less. I swear. :D
> >
> > 2.5 Patch:
> > http://projects.blender.org/tracker/index.php?func=detail&aid=19252
> >
> > Roland
> > harkyman
> > _______________________________________________
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> > Bf-committers at blender.org
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> >
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>