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Banding

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  #11  
Old 01-12-2007, 09:29 PM
berwin berwin is offline
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Re: Banding

This is an attempt to reduce the banding somewhat in PS7 in conjunction with the plug in "Adaptive Equalization". As you can see in the attached palette copy, first the BG was copied (BG-Copy-AE-150-Filliff-6%) and AE applied with "Add percent of the original" at 150. In the layers palette, the mode was set to "Difference", and the FILL was reduced to 6%. That took out some of the middle tone banding.

Now for the dark tone banding:
A stamp was made of the preceding two layers (Stamp-AE-1-Filliff-6%), AE was applied again with "Add percent of the original" at 1%, the mode was set to "Difference", and the FILL was reduced to 6%. These two AE layers were put into a set for the application of a mask to mask out the darkening effect to the lighter part of the image.

Finally, a stamp was made of all preceding layers and reverse USM applied (Stamp-USM 40, 30, 0) with a mask to reduce the USM in the dark and too light areas.

Assigned aRGB to pop up colors and converted to sRGB for posting.

Warning:
This method seems to work well in PS7, and perhaps also in PS6, but may not work in PSCS, and perhaps above. The behavior of the FILL seems to work differently here.

Regards,

Berwin
Attached Images
File Type: jpg banding.jpg (96.4 KB, 50 views)
File Type: png bandingpallette.png (68.7 KB, 12 views)
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  #12  
Old 01-12-2007, 11:27 PM
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chillin chillin is offline
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Re: Banding

I used:
FFT BandpassFilter
Neat Image
& some scratch remover in PSP
Attached Images
File Type: jpg Side-#035---247-a1c.jpg (93.3 KB, 40 views)
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  #13  
Old 01-13-2007, 01:54 PM
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Cameraken Cameraken is offline
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Re: Banding

Hi Chillin

Please could you point me to some info on a FFT Bandpass Filter?
Google found a little info on Matlab. Is that what you are using or is there another program.
I have used FFT before but I’ve never heard of FFT Bandpass

Thanks.

Nice job. Berwin


Ken.
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  #14  
Old 01-13-2007, 02:12 PM
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chillin chillin is offline
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Re: Banding

Here you can download the ImageJ plugins
and here the application
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  #15  
Old 01-13-2007, 03:24 PM
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Cameraken Cameraken is offline
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Re: Banding

Hi Chillin

Thanks.

I already had ImageJ installed but I had never looked at all those plug-ins.

Looks like I’ve got some new toys to play with now.

Thanks Again.

Ken.
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  #16  
Old 01-14-2007, 09:54 AM
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Craig Walters Craig Walters is offline
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Re: Banding

chillin,

how do you like imagej? i had heard mixed things about it.
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  #17  
Old 01-20-2007, 10:39 PM
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chillin chillin is offline
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Re: Banding

It has a lot to offer for someone who knows what to do.
I just scratched the surface, but I like to experiment
Here I tried again

Last edited by chillin; 01-21-2007 at 11:15 AM.
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  #18  
Old 01-23-2007, 08:23 AM
Bojin Taylor Bojin Taylor is offline
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Re: Banding

How did you finish up with this?
I see a lot of feedback on the probable cause and a little on correcting it.
I have the 5D and recently shot the Nutcracker performance. I had intermittant banding in the shadows.Maybe 1 shot in 50. I was shooting @ 1600 which surprisingly enough rarely gives me any trouble.
Can I see your finnished work onn this image and what you did to clean it up?
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  #19  
Old 01-23-2007, 08:38 AM
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Cameraken Cameraken is offline
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Re: Banding

Hi Bojin.

Can you not see the pictures here?
Post your image here if you want. We can try yours.

Ken.
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  #20  
Old 01-24-2007, 04:44 PM
Bojin Taylor Bojin Taylor is offline
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Re: Banding

this is an example. it was not consistant maybe 1 in 50 and even more random then that.
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File Type: jpg digital-noise-1.jpg (100.0 KB, 16 views)
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