Targa Display Help
My guess is that they don't emulate the Targa16 perfectly, and the stock
rdptarga.exp driver is getting a little confused. Either that, or they
emulate the Targa16 Plus, and you ought to be using the rdptargp.exp
driver. One way or the other, it's got to be a driver issue.
And yes, having 24 bits of color will allow the compositing to be
completely seamless. It's the different between 15 bits (not 16, cause one
bit is an overlay bit), which is 32 luma shades of each compositing color
(5x5x5), or 24 bits, which is 256 luma shades. BIG difference.
– G