Am 04.03.2016 um 22:27 schrieb Christian Froeschlin:
> On 04.03.2016 21:02, Satadorus wrote:
> 
>> - If I specify a greenish background and that colour also appears in my
>> rendering, is ONLY the background transparent? Or also part of my
>> rendering.
> 
> It doesn't work like a green screen. Parts of your render will not
> become transparent just because they accidentally have the same color.
> However if an object itself is partially transparent (e.g. glass) and
> the background contributes to the rendered pixel I think it will be
> partially transparent when rendered with alpha output (at least if
> the file format supports that).

This is indeed the case for transparent or partially transparent objects.

Note however that it is /not/ the case for reflections.

Also, if the background is not entirely transparent, neither will the
resulting image.

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