> Quote - Alas, the trick with the color math does NOT work in DAZ|Studio, Poser 4, Pro Pack, or Poser Artist. What you CAN do is take the head texture map into Photoshop/PSP, add the "shadow mask image" as a second layer, multiply the layers and save as a new head texture map, one that you only apply to the nostril material.

Actually a DAZ Studio user that's doing some work for Netherworks figured out that you can get overlays in DAZ Studio.  Say you want to apply the anti nostril glow,

1. Go into the Surfaces tab, Advanced view,
2. Click on the down arrow in the Diffuse Strength (NOT Diffuse Color),
3. Browse to where you have that file and apply it to the Nostrils and Skin head (use Ctrl click to select them both and apply the texture file at the same time! )
4. Render!!   

See image to see the results and the settings beside it! 

All the best

Richard ;-)~

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