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FFT Madness Part II

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  #1  
Old 02-17-2005, 11:32 AM
cheg cheg is offline
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FFT Madness Part II

Hi again

Since I'm obviously too dense to get the whole concept, does anyone have a link to a website which takes you by the hand an leads you itty-bitty step by itty-bitty step through the process? I have but one more day to optimize this photo of one of my work colleague's father who passed away. All I got was a newspaper, so the scan is, well, pixelated as one would expect. I've read the tutes in this forum, I've posted my woes, but there seems to be little tidbits of info missing for me to complete this task succesfully.

Yesterday I posted this
" Ok, found it but...
In Rô's FFT tutorial , he says to make the image grayscale and duplicate the layer. Once that's done, Alex Chirokov's filters are still greyed out. They only appear when I convert the psd file to RGB. What am I doing wrong in this case? Does the image have to be in another format? Jpg? Tiff?"
but no one answered, so I'm hoping there's an in depth tutorial on this filtering process.


Cheers

Alex
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  #2  
Old 02-17-2005, 11:35 AM
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kiska kiska is offline
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Alex, i wish I could help, but I haven't figured out the !@#$%FFT either.
Sorry.
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Old 02-17-2005, 11:47 AM
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Swampy Swampy is offline
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Alex

Your scanner software should be able to be set to print from newsprint and allow for descreening as you scan. I've gotten some crediblel results by playing with the scan software's settings.
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Old 02-17-2005, 11:55 AM
cheg cheg is offline
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Quote:
Originally Posted by Swampy
Alex

Your scanner software should be able to be set to print from newsprint and allow for descreening as you scan. I've gotten some crediblel results by playing with the scan software's settings.
I guess I should have mentioned that I had used the descreening function with the scanner software... I want to correct the image at the Photoshop level.

Thanks tho!
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  #5  
Old 02-17-2005, 12:04 PM
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MBChamberlain MBChamberlain is offline
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OK....You need to desaturate the image, not convert it to greyscale. Because the FFT function creates three channels it needs three channels to work with.

1) Duplicate the whole image (right click the bar and select duplicate)
2) Choose Image>Adjustments>Desaturate
3) Run the FFT filter
4) Convert from RGB to HSB
5) On the green channel clone out the stars (not the one in the middle) using lighten as the blend mode (the heal brush set to normal works well too)
6) On the blue channel clone out the stars (not the one in the middle) using darken as the blend mode (or heal)
7) Convert from HSB to RGB
8) Run the IFFT filter
9) If the original was a color image with a pattern you can copy your new image back to the original and set the blend mode to luminosity

If you are doing a news paper scan, you might try scanning it in CMYK, copy each channel to its own file, and run FFT on each, then recombine them.
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Old 02-17-2005, 01:05 PM
cheg cheg is offline
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MBChamberlain...

You da Man!

Thanks....you provided that one little thing that made all the difference in the world!

Cheers

Alex
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  #7  
Old 02-17-2005, 01:18 PM
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T Paul T Paul is offline
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Love to see a happy ending!

~T
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Old 02-17-2005, 02:41 PM
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MBChamberlain MBChamberlain is offline
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glad to help
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  #9  
Old 02-18-2005, 03:13 PM
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jonk jonk is offline
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FFT with CS

Has anyone tried using the FFT filter with Photoshop CS? I keep getting an error when running the FFT filter, and I think the problem is because it was written for PS 7.0.

Jon
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  #10  
Old 02-18-2005, 04:38 PM
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vinniesworld vinniesworld is offline
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No problem here with CS, it works fine for me.
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