Hi! There are a lot of clever people on this forum and I wondered if I could get some feedback from you about the white paper I just wrote on sharpening. The official title is "Sharpening in Photoshop CS4". It includes a fair bit of math and the results of a lot of testing. I would have liked to have decoded the Smart Sharpen algorithms, but after some weeks of research, I just made it through the USM. freixas's Gallery I'm particularly interested in any errors I might have made in any of my math or my testing. Thanks for your time!