I don't know much about that, but if green inversion is a problem you could try the red/green inverter I made for freestuff called "green thingy" a while back. I'm Pretty sure it's still featured on my homepage under freestuff. I don't know if it will work for you but it's worth a try i guess. I'm sure there are other things to try as well - on the mac someone has something similar. If I though about it I could come up with their name. In fact that person gave me a pointer as to how to set up the formula and checked it out as to if it worked properly. And some paint programs might offer this feature as well. - TJ