I had the same issue. Reverse the alpha channel and it will work just
fine.

Steve Martin wrote:

> I'd like to do some compositing with images from POV-Ray using the
> alpha channel in the TGA file. Unfortunately (and I can't believe
> I'm the first to notice this, so I assume it's something I'm either
> not understanding or doing wrong), it seems that the alpha channel
> in the rendered image file is "reversed" from what it should be
> (i.e. 0 instead of 255 and vice versa). I rendered a simple test
> sphere, no specified background, one light, very simple. When I
> call the image up, I find that there is a hole in the middle of the
> image right where the sphere ought to be... but I can see the black
> background with no problem.
>
> I thought perhaps it was something about TGAs, so I converted the
> file to a GIF. Same thing... a black background with a hole in the
> image where the sphere should be, exactly backwards from what I
> expected.
>
> (BTW, I'm using ImageMagick and POV3.1g on a RH6 Linux system do
> do all this.)
>
> Can someone tell me what I'm doing wrong?

--

Josh English
eng### [at] spiritonecom
ICQ: 1946299
"Stress is when you wake up screaming and realize you haven't fallen
asleep yet."

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