I did a bit of investigation, and I agree that 3 bytes per pixel seems to be the rule, not 4. I did this using photoshop, not poser, but even there an uncompressed 24 bit image seems to be in a different format than what I find documented on the web.

The screenshot is a hex dump of a 10x1 pixel BMP with alternating white and black pixels. This BMP shows me that we have FF FF FF 00 00 00 FF FF FF 00 00 00 repeating patterns.. Hmmm..

There's one (small) thing that may be wrong..

This is a super zoomed in screenshot of the upper left corner of the combined image. I wonder if the colors are correct. I put this on a black background (pixels = 0x00 0x00 0x00). The camera names are solid white (0xFF 0xFF 0xFF).

In a perfect world (which I realize red-blue filters ain't) we would see a white Main Camera through one eye and a white Aux Camera through the other eye. They would both appear "white". Now I know they can't be white, but is something close to that happening? I am without red-blue glasses, as I have droned on endlessly about already..