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Fading problem

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  #1  
Old 06-30-2010, 09:07 AM
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Florin Florin is offline
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Fading problem

Hi everybody. I need an advice about a problem with the background of a new portraiture I`m doing right now:
http://i47.tinypic.com/2wqy1ch.jpg
The image is 800 dpi / gray scale / 8 bits channel.
As you can see, when I`ve adjust a little the levels, fading was lost and now I have these "bands" which can`t be smoothed. I tried all kind of blurs, I changed the mode to 16 bits channel, 32 bits channel and nothing, tried to paint the area again but no way, everything failed.
Any suggestion?

Regards
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  #2  
Old 06-30-2010, 10:01 AM
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Der_W Der_W is offline
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Re: Fading problem

That looks like banding to me.
Does it occur in print as well?
If it does, you could try to add some noise to those areas, that'll break up the banding a little (how much depends on the strength. I'd suggest something about 0,7 Gaussian monochromatic).
Maybe you'll want to blur it first heavily (to get more uniform banding all over) and apply the noise afterwards.
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Old 06-30-2010, 10:18 AM
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Florin Florin is offline
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Re: Fading problem

Hi Jonas. No, I`m not ready yet, I`m still working on it. And, I`m not printing, just deliver the final art. My cilents commented sometimes about some banding details. This banding is visible every time when levels or curves are used. In the past I used the noise, as you say, and this helps a little but just at the end, when the job is done.
The bands also appear in the RGB mode, some yellow and magenta colors sometimes.
Thank you
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Old 06-30-2010, 10:32 AM
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Re: Fading problem

Florin, the best way to avoid the banding is to edit in 16 bit. That will go a long way to mitigating banding when doing a levels adj.
Now that you have it, there are a number of ways to eliminate it. One quick method would be to select the affected area and apply a Gradient Map adj layer. Select 1 single color or two close colors (or shades of Gray) for both ends of the gradient. If the result is too smooth, you can just Filter>Noise>Add Noise; Monochromatic, Uniform, 1%.
Regards,
Murray
Attached Images
File Type: jpg Florin 2wqy1ch MM GM.jpg (94.6 KB, 50 views)
File Type: jpg Florin 2wqy1ch MM GM+Noise.jpg (136.8 KB, 57 views)
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  #5  
Old 06-30-2010, 10:45 AM
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Re: Fading problem

Thanks M. I`ll try this. Let`s see how it works. As I said before, changing to 16 or 32 bits mode did not helped.
Cheers
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  #6  
Old 06-30-2010, 07:09 PM
secretagents secretagents is offline
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Re: Fading problem

http://www.richardrosenman.com/media...es/diffuse.zip

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File Type: jpg 2wqy1ch2.JPG (77.0 KB, 32 views)

Last edited by secretagents; 06-30-2010 at 07:15 PM.
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  #7  
Old 06-30-2010, 07:22 PM
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Re: Fading problem

Florin,
I would agree with Murray's approach; I like Secretagents as well. He is correct in that once the banding is there, there is no way to reverse it. You must edit or replace that area.

Banding is caused by performing a "destructive" editing process to a rather uniform but gradient color area. The result of something like "levels" will force the existing gradient to be "remapped" over a broader area... the result being similar to interpolation... but never as smooth a gradient. So, you see banding start to occur. Another common problem is pulling a low bit-depth image into a higher bit-depth image. The low bit-depth image will often have banding after this process.

You may have a problem with a template you are using to replace backgrounds. Check those templates for banding issues, or for bit depths that may be lower than your most common edits, i.e. you edit images in 16-bit, but your templates are in 8-bit. You may need to recreate the templates and save in several bit depths. That way you can pull in whichever template that matches your current images' bit depth.
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  #8  
Old 06-30-2010, 09:26 PM
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Florin Florin is offline
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Re: Fading problem

Thank you so much, all of you. I like a lot the Secretagents sample. I`ll use the filters in a while.I was also ignoring the technical detail, thanks Tommy, very good explanation. I had very often this problem when use levels or curves. As I`m working with very high resolutions, 800-1000 dpi, I avoid the 16 or 32 bits mode because the image turns to hell, 200-300 Mb. On 8 bits it is more confortable. I have some first class 8 Gb RAMs but I tried to avoid an overcharged work file.
When it will be ready I`ll upload a sample.
Many thanks again

Last edited by Florin; 06-30-2010 at 09:55 PM.
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  #9  
Old 07-01-2010, 04:37 AM
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Re: Fading problem

You could test adding noise on it then a small amount of blur, sometimes it's works (not garanteed) , and just one thing...is it at 100%? I know it sounds obvious but, sometimes if the displays show a smaller view it happens...
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  #10  
Old 07-01-2010, 07:04 AM
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Florin Florin is offline
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Re: Fading problem

Yes, I did this, adding noise. It`s a damn problem. Once it appears we have problems. Almost always when I`m using levels or curves. Thank you
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