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Sims 2 makeup works completely differently from Sims 3 makeup, so I don't envy you the task of trying to convert anything - you'll need to use the alpha from the sims 2 texture as your red channel, then paint on any highlights/shadows as the other channels by hand. You could try doing that automatically, but, eesh.. it'd be more trouble than it's worth to tweak and tweak and tweak to get an automatic colour split looking right.
There are a few tutorials on making makeup at the bottom of this page:
CTU Tutorials" target="_blank">Tutorials:TS3
CTU Tutorials
wiki. I don't know exactly what you want to do, but for most things I would think the lipstick or face overlays tutorial (both actually cover lipstick, it's just that one has an odd name
) would be the most relevant - eyeshadow, blush etc. all work in the same way as lipstick.
What I lack in decorum, I make up for with an absence of tact.