Solution for scanned pictures on textured paper

[Dieter Mayr]

Hello

Almost everyone who needs to scan printed pictures know about the problem with textured paper, which often pronouncees its texture on the scan.
In a german forum i runned into a link which gives a surprisingly well working solution:
http://commons.wikimedia.org/wiki/Commo ... r_analysis
The neccesary Fourier Transformation is done by a photoshop plugin, the link to it is provided on the linked website.
I have tried the abouve solution, with all steps done in PWP, just for the FFT and IFFT operation i went to PS.
The Plugin runs on my old PS6.
My first try was a actual scan of a B&W-Image:

20696267-1.JPG (31.9 KiB) Viewed 3995 times

The file was FFT-ed in PS and importet in PWP, then the contrast was enhanced and the bright spots marked in a mask and then using Composite on the original FFT-ed with the Maskand pure Black as overlay:

20696267_fft-1-1.JPG (39.05 KiB) Viewed 3995 times

Then back to PS and IFFT-ed the file give the surprisingly good result:

20696267_1-1.JPG (28.49 KiB) Viewed 3995 times

This method could, to my opinion, be useful to some, so maybe it would be possible one day to implement the FFT and IFFT functions directly to PWP to safe the way around to PS.

[Dieter Mayr]

I also gave the image posted in the above link:
Separation in cannels was done in PWP, converting from 8 bit B&W to 24 bit color, FFT done again in PS, Masking done in PWP as above, IFFT in PS and finally reassembling the channels in PWP.
Before:

Rosa_Gold_Glow_2_with_interference.jpg (48.27 KiB) Viewed 3996 times

After processing:

Rosa_Gold_Glow_2_with_interference_G_1-2-1.JPG (43.76 KiB) Viewed 3988 times

Since the image is quiet small so the bright spots are quiet hard to locate, so the result can be improved with a bigger image.

[tomczak]

For those wishing to try how useful FFT may be in image processing, you may want to try MeeSoft's Image Analyzer - a freeware.

http://meesoft.logicnet.dk/

[MikeG]

Thanks for the link - interesting site.

Mike.

[MikeG]

Here's a link for anyone wishing to know a bit more about Image Analyser:

http://www.retouchpro.com/forums/softwa ... lyzer.html

Mike.