Here's an alternate IR workflow to experiment with: (Note this won't work on B&W IR images of course)

This is for Photoshop, but should work in other image processors as well that have similar functionality:

1. load IR image
2. duplicate image to new layer and select this layer.***
   ***3) Change Blend Mode to Color
   4) Image>Adjustments>Auto Color
3. Image>Adjustments>Invert
4. Use Hue/Saturation  Adjustment Layer to tweek colors
5. Use Selective Color Adjustment Layer for more tweeks

Again its all about experimenting...give it a go and share your results.

J:woot:e