Am 18.05.2012 23:59, schrieb Thomas A. Fine:
> Hi,
>
> I've just tried out the +UA option to turn on alpha channel in the output
> based on the background.  I'm using a very simple image of an object
> that is not transparent, and everything else is background.  The background
> part is coming out transparent, however the object's highlighting is much
> dimmer with the alpha channel on.
>
> I've tried turning up the specular crazy high, and I just end up with a large
> grey spot where a large highlight should be (but it isn't getting alpha channel
> stuck in there, i.e.  nothing is showing through where the highlight is).
>
> I can't imagine why this would be happening.  I also looked for known
> bugs (I'm using version 3.6 at the moment) but couldn't find anything.
> It does seem there's a bug related to highlighting on objects that DO
> have some transparency, but as I said, my test object is totally
> opaque.

I've never heard of anything like that happening in 3.6, although it's 
been out quite a while now, and the thing you're doing sounds like a 
standard use case, so I'm a bit puzzled about this one.

Does this affect both the render preview and the generated image file? 
Can you post the complete scene? What output file format are you using? 
What's your exact version of POV-Ray?

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