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<body class='hmmessage'><div dir='ltr'>Hmmm, some of those changes on the demo page are pretty drastic. I've always thought that blending modes were a defined calculations, so they'd be the same everywhere (Blender, photoshop, after effects, nuke, everything...). If that's true, and updating them causes a major changes in the resulting image, were they broken before? Are they fixed now? Which way is the "correct" way? That's the way I would vote for.<div><br></div><div>Hope that makes sense.</div><div><br></div><div>Sean<br><br><div><hr id="stopSpelling">Date: Thu, 5 Jun 2014 17:05:27 +0200<br>From: kevin.dietrich@mailoo.org<br>To: bf-compositor@blender.org<br>Subject: [Bf-compositor] Question regarding changes to blending modes<br><br>
Hi people,<BR>
<BR>
I'm currently writing a patch to rework the state of blending operations inside of Blender. Right now the operations are defined in multiple places around the code base so I thought it could be good to ease out maintenance of that part of the code and to have them all defined in one place. So far, so good.<BR>
<BR>
By running some speed-tests, out of curiosity, I noticed that (at least in the compositor) the Hue, Saturation, Color and Value modes were the slowest. And that is apparently due to multiple RGB <-> HSV conversions. So I did some searches and found some interesting simple formulas which do not rely on those conversions.<BR>
<BR>
Now, these modes are a little faster (~10-12%), but they do look a little different than before, especially the Value blend mode(, and that is a little strange).<BR>
<BR>
So the question is: would the users (especially module members) agree on that change ?<BR>
<BR>
To have a look at the patch, or to test it, or just to see the difference between the before and after for those above mentioned operations, please head over to http://developer.blender.org/D539 . I have uploaded there a few images demonstrating the changes.<BR>
<div> </div>
<div>Sincerely,</div>
<div> </div>
<div>Kévin Dietrich.</div>
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