See exemple atached:<div><br></div><div>Render with transparency and saved as TIF 16bits RGBA.</div><div>Composed in Photoshop over a red BG.<br clear="all"><div><div><br></div><div><div>Adriano A. Oliveira</div><div><br></div>
</div></div><br><div class="gmail_quote">2012/12/12 Brecht Van Lommel <span dir="ltr"><<a href="mailto:brechtvanlommel@pandora.be" target="_blank">brechtvanlommel@pandora.be</a>></span><br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
Hi,<br>
<br>
As far as I know, the new color management changes in 2.64 should not<br>
introduce any extra fringes compared to before. If that's the case it<br>
would be interesting to understand why.<br>
<br>
This option is definitely a color management option though, and<br>
affects compositing as well, I don't think it's correct to place it in<br>
the Film panel. The exposure option in the film panel will be removed<br>
eventually, it's a separation option but it should really be using the<br>
color management settings instead. Maybe it should be there anyway,<br>
but ideally we could find a better way to communicate things rather<br>
than duplicating the option, or maybe the default value should be<br>
changed.<br>
<br>
In any case, the unpremultiply option is something that should be<br>
avoided when possible, there is no right way to use it, depends a bit<br>
on the image what looks best, but the result will be subtly wrong<br>
either way. Ideally you should never do color space conversion on an<br>
image that has an alpha channel, which means working in linear float<br>
color space and only doing the color space conversion at the very end<br>
when everything is composited together. Though it's not always<br>
possible to set up an entirely correct color pipeline with external<br>
tools involved.<br>
<br>
Brecht.<br>
<div><div class="h5"><br>
On Wed, Dec 12, 2012 at 3:34 PM, Adriano Oliveira<br>
<<a href="mailto:adriano.ufrb@gmail.com">adriano.ufrb@gmail.com</a>> wrote:<br>
> Since 2.64 I've problems with transparency finges when editing render<br>
> outside Blender.<br>
> Last week I discover the "Color unpremultiply" option and every thing is<br>
> fine again.<br>
><br>
> I supose that many others like me are having hard times dealing with<br>
> premultiplied fringes due to new Color Management been so far from render<br>
> options.<br>
><br>
> My proposal is to merge Color Management in the FILM slider at Render<br>
> Options.<br>
> At least, "Color unpremultiply" option should be near TRANSPARENCY option,<br>
> even if it is repeated in Color Management, like Exposure seams to be.<br>
><br>
> Adriano A. Oliveira<br>
><br>
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