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Gradient Banding Help

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  #1  
Old 06-07-2011, 12:30 PM
nowheremanphoto nowheremanphoto is offline
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Gradient Banding Help

Hey, guys!

Wondering if you guys can help. I wanted to add a background light in post with a simple white large soft brush tool which I blurred out as well and just masked out my model. As the edges fade to nothing there's an increased banding effect as the background shows through, which will not change no matter if I blur the gradient or not. There was no banding in the background before this.

Photo color space was Adobe RGB (1998).

http://farm3.static.flickr.com/2223/...ca2ab243_z.jpg

(I'll post a "before" photo when I get home tonight.)
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Old 06-07-2011, 12:40 PM
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4personnen 4personnen is offline
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Re: Gradient Banding Help

Have you tried to add some noise to the background? Usually blurring makes banding worse...
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Old 06-07-2011, 12:44 PM
nowheremanphoto nowheremanphoto is offline
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Re: Gradient Banding Help

Thanks for the quick reply!

Interesting, I've never noticed that before, though I'm not in the habit of adding things to my backgrounds in post. Should I add noise to the background or two the gradient over the background?
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Old 06-07-2011, 12:57 PM
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4personnen 4personnen is offline
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Re: Gradient Banding Help

I usually add it the the gradient.... You have to break the "absence of texture"... However there is some cases where it doesn't work too well. Better to have the largest range (16 bits).
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Old 06-07-2011, 01:13 PM
nowheremanphoto nowheremanphoto is offline
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Re: Gradient Banding Help

Thanks again! I'll give it a shot tonight and let you know!
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Old 06-07-2011, 01:56 PM
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artofretouching artofretouching is offline
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Re: Gradient Banding Help

Yes, adding noise to the gradient, and working in 16-bit should eliminate the problem. I would add by saying that if this is for press, you should add a tiny bit more than you think you need. For example, if adding noise of 2 looks good on screen, make it 3. It will look strong on screen, but print as expected. If you go too weak, you will still see the bands on there printed piece.
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Old 06-07-2011, 02:41 PM
nowheremanphoto nowheremanphoto is offline
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Re: Gradient Banding Help

Thanks artofretouching! Very helpful!
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Old 06-07-2011, 03:13 PM
Rust Rust is offline
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Re: Gradient Banding Help

Try filter-brush strokes-spatter-spray radius approx. 8 smothness 1. Just play around with the values. Add layer mask and paint in on the background
Another tips is to do as much of contrast, luminance work in ACR, to prevent this banding.
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Old 06-07-2011, 03:38 PM
nowheremanphoto nowheremanphoto is offline
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Re: Gradient Banding Help

@Rust… thanks, I'll give that a whirl too.

I'm not sure what you mean by "do as much of contrast, luminance work in ACR". What kind of luminance/contrast work in ACR would prevent the banding?
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Old 06-07-2011, 09:55 PM
nowheremanphoto nowheremanphoto is offline
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Re: Gradient Banding Help

Thanks all! Unfortunately I was working in 8-bit mode (adjusted my workflow for the future), so I couldn't COMPLETELY get rid of the banding, but I've got it down to a manageable level, so thanks a bunch.

http://farm3.static.flickr.com/2223/...e7ca8009_z.jpg
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