Probably the easiest way is to have the 3 distinct colours primary colours that aren't used elsewhere on the strip, Magenta (255,0,255), Green (0,255,0) and Yellow (255,255,0) for example. Then simply make a copy of the original graphic, loop through the pixels using readpixelfast and if you find any of those 3 colours replace with the colour you want using a writepixelfast.
If however, you've got some shading in there then I would suggest doing the base image as full colour with grey scales on all the bits you need to colour. Then have 3 seperate 1 bit images for the 3 coloured areas, run through the colour area bitmaps giving the grey of the base image the required hue.
If however, you've got some shading in there then I would suggest doing the base image as full colour with grey scales on all the bits you need to colour. Then have 3 seperate 1 bit images for the 3 coloured areas, run through the colour area bitmaps giving the grey of the base image the required hue.