Some general thoughts on deblur, unblur, focus issues etc...
http://rainier.medinfo.rochester.edu...cOutline1.html http://www.ph.unimelb.edu.au/~jpc/pa...ur/samples.htm http://www.indiana.edu/~elegans/Deco...nAppNotes.html
I usually consider restoring focus to be different than sharpening, although my hack methods are similar. A duped layer (perhaps despeckle) is set to overlay or other neutral blending modes suitable for this task (soft/hard light etc or new v7 blends). The emboss filter is used in a subtle attempt to add focus (try to match the highlights and shadows in the image with the right emboss angle). An edge mask or selective masking can also be added so that the whole file does not have this 'correction' globally applied.
Follow this link for a Photoshop action to help restore focus:
http://www.retouchpro.com/forums/att...=&postid=27061 http://www.retouchpro.com/forums/sho...5&pagenumber=3 http://www.retouchpro.com/forums/sho...ghlight=unblur
Chris Russ from Reindeer Graphics was asking about what software they could develop to help retouchers/restorers (in the software forum a while back)...I suggested deconvolution or some other method as in the above links to help users add snap to poor focus images (over what sharpening can do). I personally think this is an area waiting for commercial exploitation for a software maker, I do not expect miracles in results and from what I have seen from low funded projects a commercial developer could provide a very nice tool if they thought there was a market...
Regards,
Stephen Marsh.