Floyd L. Davidson
Eric Stevens <eric.stevens@sum.co.nz>wrote:

Eric Stevens
Clark Vision have published articles describing their tests with all these things using Photoshop. See for example http://www.clarkvision.com/imagedetail/image-restoration2/index.html>

Floyd L. Davidson
Read it a little closer Eric, Roger Clark did not use PhotoShop for Richardson-Lucy Deconvolutional sharpening, he also didn't even mention the Wavelet sharpening that I have previously commented on.

Clark does describe Unsharp Mask using PhotoShop to be specifically much the same as USM is in other editors.

He also points out the "Smart Sharpen" is the kind of problem that I described, where the user cannot tell what it might do. Some settings may use a different mix of two or more types of sharpening. It's the kind of thing you just adjust until it looks "wonderful", and have no idea if that setting would also be useful on the next image or not.

Roger is very good at collecting data and graphing it for useful presentations. He has serious problems interpeting the data at times, and while he becomes extremely defensive when challenged he does learn from discussions and also edits his web page articles to indicate what he has learned. You might notice that the page you cite was recently updated... primarily due to a discussion that I and several others participated in where many of Roger's original conclusios were shown to be not quite as clear or accurate as they could be. I of course don't think he moved far enough, and I'm sure he thinks the same about me. We both moved some, and it was all in all a very intensive and useful discussion.