I have refractive object with color fog. Affect channels is set to “affect all chanels”. I get coloured alpha.
How can I use this kind of alpha? In Natron for example?
Thx for answer.
Ok - so when I render alpha to separate file how can I use this file in Natron? This is maybe dumb question but I have animation with coloured glass and i have to output this as png files with transparency.
When I import exr files to natron I lose color on the glass…
I do animation and compositing in Natron rather rarely 
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sorry for my English
