Dave, here are some references:
Fourier Transforms -- ImageMagick examples
http://www.imagemagick.org/Usage/fourier/
Fred's ImageMagick Scripts: FFTFilter
http://www.fmwconcepts.com/imagemagick/fftfilter/index.php
Be warned that installing ImageMagick is not for the faint of heart, and
this is largely command-line stuff (ie you have to be comfortable with
issuing DOS-like commands in Terminal.app).
There are a couple of FFT plugins for Photoshop (and Elements), but
unfortunately *only* for Windows. And they are a moving target; the
places where they are hosted keep disappearing. See this article:
http://www.curvemeister.com/forum/index.php?topic=62.msg13586#msg13586
... this tutorial:
http://www.skeller.ch/ps/fft_action.php
... and this:
http://www.3d4x.ch/Swift's_Reality/FFT_Photoshop_plugin_by_Alex_Chirokov/16,35
Cheers!
-bmw
On 11-05-26 9:52 AM, David J Brooks wrote:
On Thu, May 26, 2011 at 9:50 AM, David J Brooks<pentko...@gmail.com> wrote:
That is really good. I googled the names you put in your last post and
looked at the scripts. I did not understand the script thing at all. I
need more time to look into it and try to understand it. Slow learner
here.
I did send her my version in PSCS using de speckle and curves with
some bluring of the uter edges to try and soften the lines left after
despeckle. Seems she is happy with that, HOWEVER
Ar hit send to quick.
However i will forward your version to her as well.
Thanks for the help folks, this has been an interesting 2 days.
BTW the scan is taken of a picture of a picture, and the lines are in
the second photo, not from scanning.
I have marked this posting for future references.
Dave
On Wed, May 25, 2011 at 8:24 PM, Bruce Walker<bruce.wal...@gmail.com> wrote:
On 11-05-25 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
OK, I took the FFT processed result and did some spot-cloning, noise
reduction (Noiseware Pro), two passes of Smart Sharpening and finally levels
to improve black level and contrast/brightness ...
http://dl.dropbox.com/u/2254722/picture0001-filtered2a.jpg
Printed at a modest size on metallic paper, this would probably look pretty
good.
-bmw
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Documenting Life in Rural Ontario.
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