Well done! I'm impressed. Paul
On May 25, 2011, at 4:20 PM, Bruce Walker wrote: > On 11-05-25 11:17 AM, David J Brooks wrote: >> A good friend of mine has a scan of an old family photo in pretty >> rough shape and asked me last night if i could help fix it. I just got >> the scan a few moments ago: >> >> http://www.caughtinmotion.com/picture0001.jpg >> >> and had a quick look. I'm not even sure i know how to go about >> touching this up. I told he i would look and at least try. >> >> Any comments or help. >> >> She tried to send a large Tiff file but on dial up the 24mb photo >> would not load so she just sent me a 2.5 MB jpg. >> >> Any help is appreciated. >> >> Dave > > As others have pointed out, your biggest challenges are (1) removing the > paper texture, and (2) decreasing the softness. But it turns out that #1 > isn't as bad as generally thought, and #2 can be addressed too. > > The solution to the first problem lies with the FFT, or Fast Fourier > Transform. You convert your image into the frequency domain, look for > symmetrical mid and high frequency components that shouldn't be there, mask > them out and reconvert back to image space. > > You can uncross your eyes now. :) > > To prove that that works, here's your image after some processing I just > tried ... > http://dl.dropbox.com/u/2254722/picture0001-filtered2.jpg > > I used ImageMagick and "Fred's Scripts" (fftfilter, spectrum) to create the > image spectrum and process the image, and Photoshop to create the filtering > mask. > > You can deal with #2 by using Photoshop's Smart Sharpen filter set to do > "local contrast enhancement" style sharpening. Basically you crank the Radius > upwards to the range 16-32 and set the Amount down between 12% to 25%. I > tried two passes with that and got reasonable results (not shown in the image > above). > > Of course you also need to patch up the little places where the emulsion has > flaked away, but the PS clone brushes can easily handle that. > > HTH. > > -bmw > > -- > PDML Pentax-Discuss Mail List > [email protected] > http://pdml.net/mailman/listinfo/pdml_pdml.net > to UNSUBSCRIBE from the PDML, please visit the link directly above and follow > the directions. -- PDML Pentax-Discuss Mail List [email protected] http://pdml.net/mailman/listinfo/pdml_pdml.net to UNSUBSCRIBE from the PDML, please visit the link directly above and follow the directions.
