That's an interesting area of the Paw, Chris.
Here's one idea for colourising a mono image in PI: Use LRGBCombination with the mono image as the R, G and B channels to build a white RGB image. Take a copy of the original mono image, black clip it and apply as a mask to the RGB image (this will prevent you colouring the dim background areas; another option would be to make a RangeSelection mask.) Now use CurvesTransformation to mess with the colours, e.g. boost the red.
Cheers,
Rick.
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