In GIMP, (it is what I use so it is all I know) there is a bump map tool. With it, you can make _N.dds images very quickly. If you simply take the background color of an _N.dds file and make a blank image with it the same size as the texture you are using, you can then tell it to create a bump map with that texture (in your case, a sub skin). So, the _N.dds file will match up perfectly with your texture, and you get the 3d effects. Of course, in the tool itself there are some adjustments that can be made, and you have to get them right in order for it to work. Anyway, you may want to get GIMP just to check out that feature. It's totally free.
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He sank 198,650 tons....who you ask?....Erich Topp, that's who!
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