I've found a quick and simple way to keep the 'faction colour' indexes unused. When you have your icon ready to save to tga, do this first: (I'm assuming Photoshop, but other editors should have similar facilities)
Make sure you start in RGB mode then convert to Indexed mode, selecting the 'Local Perceptual' option and Limit Colours to 208. If you look at the Colour Table, you will see the bottom three rows (ie the faction colour section) is empty/greyed out. Convert back to RGB before saving the tga, and continue as normal. When PurpGrab converts the TGA it will find no more than 208 colours and therefore not put anything into those higher indexes. This stops the irritating 'bleed' of faction colours into the icon.
...
sometimes!
Haven't worked out why yet, so safer to start with the 'proper' version first and tweak if you have a pale square in battle.
Here's some of the results I've had using BIFReader and PurpGrab:
1 - Pezhetairoi: made with BIF Reader, using faction colour 2, but lots of fiddling to kill the 'black spot' plague
2 - Hypaspists: made with PurpGrab, using faction colour 2. No black spots, but faction colour doesn't work as per previous posts
3 - Katakoi: made with PurpGrab, as a 'full colour' image limited to 208 indexes by the above method. No black spots despite all the tiny areas of transparency between limbs etc etc
Using BIF Reader to restore faction colours to a BIF created by PurpGrab also restores the black spots....
The archer top left and spearman bottom left have been remade using PurpGrab, both had black spot trouble before, and the spearman also had faction colour bleed - both problems sorted by using PurpGrab. (Look closely and you can see the single-pixel spots I had to include to stop the PurpGrab cropping issue.)
All the rest are legacy HTW icons except the peasants, of course...
Thanks so much for pointing me to this new (to me) tool, it has helped a lot

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