Rob has sent some of the worst parts of the line ridged areas over. Although I have posted the full results back, here are some small swatches of the areas and how they were modified. I hope this helps. Some of the areas had some severe lines on them which practically obliterated the underlying features. Using a spatial filter will always destroy some of these features but with the hope that it will destroy the unwanted bits more and thus raise the overall signal to noise quality of an image. Some sorts of badness are really hard to separate from the good so thats when it fails to achieve a good result. Other times its brilliant. I think the best is for things like removing halftone from images where the unwanted bit is very regular and at a significantly different frequency from the good part of the image. These images had a mix where sometimes it worked better than others. You can judge for yourself tho.