<p dir="ltr">If you combine the passes as shown in the graph there will be no halo, the output will already be premultiplied.</p>
<p dir="ltr">You would then use the Set Alpha node to give it an alpha channel. (I'm not sure if that is what you mean by "applying" the alpha channel, you should not be multiplying it in anyway, only setting it).</p>
<p dir="ltr">Also, black halos are a sign that you have premultiplied when you shouldn't, it's white halos that you see when you forget to premultiply.</p>
<p dir="ltr">On Feb 28, 2014 1:10 PM, "Adriano Oliveira" <<a href="mailto:adriano.ufrb@gmail.com">adriano.ufrb@gmail.com</a>> wrote:<br>
><br>
> But as long as color passes are not premultyplied, you will get a black halo when applyig alpha to the final image, don't you? <br>
><br>
><br>
> Adriano A. Oliveira<br>
><br>
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> 2014-02-28 1:14 GMT-03:00 Daniel Salazar - <a href="http://patazstudio.com">patazstudio.com</a> <<a href="mailto:zanqdo@gmail.com">zanqdo@gmail.com</a>>:<br>
><br>
>> Hi, this is no bug, here's the correct way to recompose the passes<br>
>><br>
>> <a href="http://wiki.blender.org/index.php/Doc:2.6/Manual/Render/Cycles/Passes#Combining">http://wiki.blender.org/index.php/Doc:2.6/Manual/Render/Cycles/Passes#Combining</a><br>
>> Daniel Salazar<br>
>> <a href="http://patazstudio.com">patazstudio.com</a><br>
>><br>
>><br>
>> On Thu, Feb 27, 2014 at 9:41 PM, Adriano Oliveira<br>
>> <<a href="mailto:adriano.ufrb@gmail.com">adriano.ufrb@gmail.com</a>> wrote:<br>
>> > BUILD: b5d6f14<br>
>> ><br>
>> > I don't know if this is a bug or not, but I am rendering dufuse and glossy<br>
>> > passes (direct, indirect, color) and I have noticed that some are<br>
>> > premultiplied (likre indirect) and others are not (like color).<br>
>> ><br>
>> > This seams to be inconsistent.<br>
>> ><br>
>> > Adriano A. Oliveira<br>
>> ><br>
>> > _______________________________________________<br>
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>> > <a href="mailto:Bf-cycles@blender.org">Bf-cycles@blender.org</a><br>
>> > <a href="http://lists.blender.org/mailman/listinfo/bf-cycles">http://lists.blender.org/mailman/listinfo/bf-cycles</a><br>
>> ><br>
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><br>
><br>
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</p>