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Photo paper texture problem

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  #1  
Old 05-22-2005, 08:11 AM
proxy proxy is offline
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Photo paper texture problem

I don't normally have a problem getting rid of paper texture but this has me stumped. The original was scanned at 1200dpi 48 bit RGB on an Epson 3170. Any help would be much appreciated.
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Old 05-22-2005, 09:41 AM
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Duv Duv is offline
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As a starting point, try the Fournier Transform Filter. You can download from the Alex Chirokov website. On your image, most of the stars to remove seem to be centred close to the centre star that you don't want to touch.

Cheers
Dave
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Old 06-22-2010, 03:25 PM
LUIS A GUEVARA LUIS A GUEVARA is offline
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Re: Photo paper texture problem

Quote:
Originally Posted by Duv View Post
As a starting point, try the Fournier Transform Filter. You can download from the Alex Chirokov website. On your image, most of the stars to remove seem to be centred close to the centre star that you don't want to touch.

Cheers
Dave
The proper name is the FOURIER Transform . This transform will convert your image into a Graph of the component sinusoids of the original image in the Frequency Domain , where you can easily pinpoint the offending Pattern Frequency and reduce it to zero, thus eliminating it. After that , all it takes , in principle , is to do an INVERSE Fourier Transform , to bring the Fourier Spectrum back to the Spatial Domain as an intelligible image that has no pattern in it.

The Alex Chirokov filter is nowhere to be found and if you do find it it will not work in current Computers . A better solution is to use Matlab and Photoshop to do it under full control. You can read about the Matlab Photoshop connection here.
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Old 06-22-2010, 03:39 PM
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Tony W Tony W is offline
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Re: Photo paper texture problem

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Originally Posted by LUIS A GUEVARA View Post
The Alex Chirokov filter is nowhere to be found and if you do find it it will not work in current Computers . A better solution is to use Matlab and Photoshop to do it under full control. You can read about the Matlab Photoshop connection here.
The Alex Chirokov filter can be found in several links - for example http://www.3d4x.ch/?c=16,35

AFAIK it will work on current computers (PC) as a plug in to Photoshop (I am using it with CS4). Cannot comment about the Matlab assume this is a commercial product that has to be paid for.
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Old 06-22-2010, 05:09 PM
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TommyO TommyO is offline
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Re: Photo paper texture problem

I'm not sure why Luis opened a five year old thread to state that... but Tony you are correct. The Alex Chirokov filter still works just fine and is available from several updated websites today. Readers can just do a search here on RP. There are also several other new FFT filters available on the web, one of which is java based and works stand-alone.

Resources:

A tutorial on the Alexandre V. Chirokov FFT filter.
http://www.skeller.ch/ps/fft_action.php

A very nice article by Skeller.


Meesoft’s Image Analyzer
http://meesoft.logicnet.dk/

Works as a stand-alone application. Simply open the file, click on operations>transformations>Fourier transform , paint out the offending frequencies, then inverse by clicking on operations>transformations>Inverse Fourier transform.


ImageJ – Image Processing and Analysis in Java
http://rsbweb.nih.gov/ij/index.html

A stand-alone java based tool with an FFT plug-in. Download the application, then click on the plug-ins>filters>FFT Filter link to obtain the FFT filter. Possibly more technical and confusing to use. But with any tool, the more you use it the easier it gets.
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Old 06-22-2010, 05:52 PM
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Tony W Tony W is offline
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Re: Photo paper texture problem

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Originally Posted by TommyO View Post
I'm not sure why Luis opened a five year old thread to state that...
Oops - did not notice the date of the original thread. But thanks Tommy for the links - something else for me to study
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  #7  
Old 06-23-2010, 08:47 AM
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Cupcake Cupcake is offline
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Re: Photo paper texture problem

Old thread, but
good Practice on this picture.
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