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

[Reuben Martin]

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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