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Removing paper embossing

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  #1  
Old 08-18-2008, 12:16 PM
Navstar Navstar is offline
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Removing paper embossing

This is just a portion of an image I'm trying to restore. Unfortunately, it's printed on this crazy textured paper.

I've read about FFT plug-ins here. Is there any FFT plug-ins on the Mac side? If not, I have a friend who has PC CS3. Does FFT work on grayscale images?

Here's an example of my problem scan:
http://i175.photobucket.com/albums/w...ar/Pattern.jpg
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Old 08-18-2008, 01:24 PM
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0lBaldy 0lBaldy is offline
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Re: Removing paper embossing

Navstar, welcome to RetouchPRO! Nice to have you aboard and hope you enjoy your time here.

I did this using Image Analyzer (for PC (sorry!) available here)
Attached Images
File Type: jpg PatternBefore.jpg (78.3 KB, 56 views)
File Type: jpg Pattern.jpg (27.3 KB, 96 views)
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  #3  
Old 08-18-2008, 06:51 PM
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Re: Removing paper embossing

Navstar,
FFT's are available for the Mac. The one described here so much (by Alexandre Chirokov) is PC based. You can google Mac versions.

Yes, Chirokov's FFT works on grayscales, as long as you have scanned them in color. We normally recommend scanning b&w's in color, as there are generally differences in the channels that we cannot see. I cannot say about the other filters out there. But, I imagine they have been improved to not rely on a particular color channel.
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Old 08-18-2008, 10:40 PM
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Re: Removing paper embossing

There is an excellent FFT processor for Macs - ImageJ, which is a public domain (free) program developed at the National Institutes for Health. With careful application, it removed your pesky texture (first attachment). However, I had more success with a simpler approach (second attachment). For that one I just ran a surface blur with radius 11, threshold 35, followed by dust and scratches filter at radius 2, threshold 0.

<C>
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File Type: jpg Inverse-FFT-of-Pattern.jpg (19.1 KB, 39 views)
File Type: jpg Pattern-d&s.jpg (33.4 KB, 50 views)
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  #5  
Old 08-19-2008, 03:41 PM
Navstar Navstar is offline
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Re: Removing paper embossing

You people are amazing!

So I tried the FFT plug-in on the PC side and got a weird solarized effect when I painted out the bright stars. Tried ImageAnalyzer for PC it would always run out of memory (The Original was 11000x6400 pixels. Also ran out of memory on a 50% reduction of 5500x3200! boo!)

Here's what I was getting with Photoshop and the FFT plug in:
FFT
http://i175.photobucket.com/albums/w.../Picture11.jpg

Painting the stars in black
http://i175.photobucket.com/albums/w.../Picture13.jpg

Intense darkening and solarizing
http://i175.photobucket.com/albums/w.../Picture10.jpg



Downloaded ImageJ and... eeek... an interface only an engineer would love. Just couldn't figure it out.

So I went with Lurch's method of Photoshop Surface Blur + Dust & Scratches. It produced adequate results which I can live with. Surprisingly Dust & Scratches got rid of the most annoying part of the texture -- the incessant highlights from the paper texture.

Last edited by Navstar; 08-19-2008 at 04:15 PM.
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  #6  
Old 08-19-2008, 05:47 PM
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Re: Removing paper embossing

Changed to RGB. Ran the FFT and the used, under Artistic, the film grain.
Below are the results.

I chose not to use Neat image because it turned out very blurry. This way kept more of the features.
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File Type: jpg Pattern2.jpg (95.2 KB, 37 views)
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Old 08-19-2008, 10:52 PM
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Re: Removing paper embossing

Navstar, there seems to be a size limit for fft

Apparently the plugin doesn't like images over 3072 on the larger side
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  #8  
Old 08-20-2008, 04:41 PM
Navstar Navstar is offline
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Re: Removing paper embossing

Well, color me impressed. Based on your suggestions, here's what I did.

I first used Dust & Scratches to get rid of the highlights. I then reduced my image to less than 3000 pixels and ran it through JImage FFT. I then enlarged it in Photoshop. Since the image was so soft to begin with, I didn't think resampling would introduce any noticeable artifacts. I'm pretty happy with the results (considering the source!)

I think I'll use KlassyLady's suggestion of using Film Grain to add some more "detail"

http://i175.photobucket.com/albums/w...vstar/Dude.jpg
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Old 08-20-2008, 06:37 PM
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Re: Removing paper embossing

Glad you found an arragement that worked for you!
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  #10  
Old 08-20-2008, 06:54 PM
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Re: Removing paper embossing

Good work plowing through all the suggestions to devise your own solution. As you can tell, there are many ways to approach a problem image and all images present their own problems. Knowing a varied set of tools is invaluable.

Looks like you got past ImageJ's interface
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an interface only an engineer would love
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