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?

Post a reply to this message