
Photo Restoration Repairing damaged photos 
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#11
 
 
Re: FFT problem. Some idea? 
#12
 
 
Re: FFT problem. Some idea?
It's called FoveaPro 4 (ReindeerGraphics.com), but I'm no sure you want to pay $800 for a 177 plugins of which you'll only use a few. I wasn't trying to push my software, but rather help you out. That Free FFT stuff you've been using has some limitations. Something else that I wrote, called ClearID ($995 from OceanSystems.com) has a onestop plugin for removing patterns (called Pattern Remover). It is intended for Law Enforcement  again at a price that is not exactly cheap. 
#13
 
 
Re: FFT problem. Some idea?
Another trick with Fourier processing  if you need to rotate, increase the image size to 200%, THEN Rotate, THEN Remove the frequencies, THEN scale it back down. Normally, rotation causes blur, but if you scale the image up by 200% first... 
#14
 
 
Re: FFT problem. Some idea?
K, I understand. I'm always working over very high resolutions, 800  1200 dpi, 6 inch wide, this is my standard work space. This is the way I can zoom in and paint even the most smallest details. I'll try to apply this in my work. I was thinking the same about the FFT, sometimes it blures too much the images. You're really a great professional, congratulations and thank you again for your time. F 
#15
 
 
Re: FFT problem. Some idea?
Interesting stuff. I have never heard of fft  is it a filter hidden somewhere in the PS (CS3) menu. Any links to explanations and other uses for fft appreciated. R. 
#16
 
 
Re: FFT problem. Some idea?
FFT == Fast Fourier Transform. It is NOT part of CSx. This transform is a way of describing a signal (1D, 2D like an image, 3D or more) as a summation of sinewaves. Short sine waves denote the "high" frequencies (meaning they repeat often) and long sine waves denote the "low" frequencies (meaning they slowly vary across the image). In audio (a 1D signal), the lows are the bass and the highs are the treble. In images (2D), the highs are the edges of your image and the lows are the gradients and "halos" around things. It is an interesting and useful mathematical space, especially for describing repeating patterns (like in this thread), but there is also a way to describe focus blur and motion blur and ways to remove it. Here's a little bit: (link) But there is a lot of stuff (including math!!) at Wikipedia. 
#17
 
 
Re: FFT problem. Some idea?
Fascinating link JCR. Much of the detail goes right over my head but the photo examples get the basic point across and are inspiring. Back in the day I would occasionally be asked to produce a roadside poster from one frame of a TV advert. Removing video scan lines automatically would have saved me heaps of time. Live and learn! R. 
#18
 
 
Re: FFT problem. Some idea?
I used Image Analyzer. I filled out the gaps to continue with the pattern, cropped the picture & applied the filter. I can't post the full size of it (it is a 35MB tif), but here is the smaller sample.

#19
 
 
Re: FFT problem. Some idea?
Thank you Chillin, this is really much better than my poor FFT resoult. However, due to the client's hurry, I started this yesterday with my traditional (painting) retouch. Here is a capture. It will take more time but it will look fine, I'm sure. Thank you a lot again for your time 

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