Adobe Photoshop Help
Skaven over at Remedy has an article online that might be of interest to those who use Photoshop. The article is titled "The power of the high pass filter". In Skaven's own words, "It's a technical feature about the wonders of the High Pass filter of Photoshop, so some of you graphic artists out there might find this handy."
If you use Adobe Photoshop, check the article out. Even if you don't use it, and are interested in what a gaming professional feels about the software, it's an interesting read.