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Diagonal pixels, cant eliminate

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  #1  
Old 03-03-2009, 02:14 PM
hurlpigeons hurlpigeons is offline
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Diagonal pixels, cant eliminate

Hello everyone,

I've been beating my head on this one for a while. I have a scan from an image that has pixel striping (sorry don't know correct term for this). I can't seem to completely get rid of it. I've used several techniques Clone stamp, patching etc.. but just can't get it where I want.

I've loaded the pic here pre and post production. I'll appreciate any direction on how to work this problem.
Attached Images
File Type: jpg Image00001.jpg (85.7 KB, 85 views)
File Type: jpg Image00002.jpg (38.5 KB, 66 views)
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  #2  
Old 03-03-2009, 05:53 PM
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TommyO TommyO is offline
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Re: Diagonal pixels, cant eliminate

There are so many methods, it is often easier just to refer you to previous threads. Here is a good one Removing Pattern. You could also do an advanced search for moire, pattern, etc. in the restoration and image help forums.
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  #3  
Old 03-03-2009, 06:09 PM
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0lBaldy 0lBaldy is offline
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Re: Diagonal pixels, cant eliminate

I may have miss-read your request... I thought your problem was the vertical banding till I blew up your repair and noticed the Diagonal lines... which may be what you are referring to..

if it is the vertical banding... I would be interested in the solution also

For the diagonals I loaded the original into Image Analyzer because of the preview button where you can see what you have repaired before finalizing the picture.. (Hint: You might want to zoom in a bit before using the filter) used Filters>Frequency Domain Filter... Just did the major stars with a size 20 pen and then darkened the field by clicking the bottom view button three times and covered any light spots I saw.. If you over-correct just click the X and start again.. I also used the Filter>Adaptive Noise Reduction filter to clean it up a bit more..

ADDED:

Took a stab at the vertical bands by selecting the far right band.. feathered selection using Select>Feather .. levels till same as the left side.... added that left side to the selection (feathered).. adjusted levels to match the next left side next to selection.. repeated till the last vertical band..selected the last vertical band on the left because it was lighter and did levels to match the rest of the picture.. used patch tool to fix small non matching areas
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File Type: jpg Image00001.jpg (34.1 KB, 39 views)
File Type: jpg Image00001BB.jpg (95.5 KB, 44 views)

Last edited by 0lBaldy; 03-03-2009 at 07:56 PM. Reason: added banding try and explanation
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  #4  
Old 03-04-2009, 01:03 AM
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chillin chillin is offline
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Re: Diagonal pixels, cant eliminate

The always helpful FFT filter.
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File Type: jpg Image00001_chillin.jpg (145.6 KB, 37 views)
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  #5  
Old 03-04-2009, 02:29 AM
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smoothfluid smoothfluid is offline
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Re: Diagonal pixels, cant eliminate

what's the FFT? I am sure I should know, but with so many acronyms I mix them up.
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Old 03-04-2009, 04:45 AM
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Re: Diagonal pixels, cant eliminate

Hi hurlpigeons,
welcome to RetouchPro!

Quote:
Originally Posted by chillin View Post
The always helpful FFT filter.
... so true!!! ... and great cleaning-up !

FFT what I used as well and it made quite a good job in transforming the 'Diagonal pixels' into common noise. (Attachment 1)

I 'denoised' the FFT Layer ...(go easy when removing noise .. otherwise you could transform the subject into a plastic doll or the whole image into a 'painting' ... ) For denoising I usually use Neat Image ... but I have started to use Photoshop own 'Reduce Noise' Tool more and more. (don't remember which PS version introduced it..)

I used Clone Tool and Heal Brush to minimize the vertical banding.

Levels to increase contrast a bit

High Pass Filter for a soft final sharpening.

(Attachment 2) the steps to my final result:
  • 1 Original
  • 2 FFT + Denoise
  • 3 Final result

smoothfluid
,
FFT (Fast Fourier Transform) is a filter that, among billions of other things, is used to eliminate/minimize repetitive patterns in images like honeycomb pattern or moiré ..

If you don't have it yet,you can download the Filter here (it's free!!) ... and here is an excellent step-by-step Tutorial on how to use it.

(Attachment 3) the stars I 'painted out'

Hope this helps..
Attached Images
File Type: jpg FFT00001.jpg (145.0 KB, 21 views)
File Type: jpg F_1Image00001.jpg (191.9 KB, 35 views)
File Type: jpg 2009-Mar-0005.jpg (175.4 KB, 28 views)
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  #7  
Old 03-04-2009, 04:11 PM
hurlpigeons hurlpigeons is offline
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Re: Diagonal pixels, cant eliminate

Thank you all, TommyO (will search like you said), OldBaldy, Chillin, and Flora . I never knew about the FFT filter. I hope I can get it to your fix Flora . Its exactly how I want it. This helps as I have other photos with this same problem.

How would you refer to this moire? Or just diagnol banding?

Again thanks for your time in helping me.
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  #8  
Old 03-04-2009, 05:45 PM
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smoothfluid smoothfluid is offline
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Re: Diagonal pixels, cant eliminate

thanks Flora, I must have been living under a rock. Always been doing it the hard way. Till now…
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  #9  
Old 03-04-2009, 05:49 PM
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smoothfluid smoothfluid is offline
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Re: Diagonal pixels, cant eliminate

just a sec, it says for PC on the info... damn. Back to the old school.
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  #10  
Old 03-04-2009, 06:48 PM
hurlpigeons hurlpigeons is offline
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Re: Diagonal pixels, cant eliminate

When I applied the FFT filter the Green channel had the "stars" not the red. I did the star correction on that channel and it worked.

Just background image was a jpeg with no color profile which I then converted to Adobe RGB.

Thxs a bunch. If you want I can post my finished photo after a few more touches.
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