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I get circles when using lighting effects.

New Here ,
Jun 06, 2017 Jun 06, 2017

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I shoot portraits on a even background then during post I select the background and add lighting effects. The effect is uneven. There are concentric circles in the gradation. Is there a fix for this?

Thank You, Andy

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correct answers 1 Correct answer

Community Expert , Jun 06, 2017 Jun 06, 2017

This is called "banding" and you use Photoshop's noise filters to reduce it.

https://www.slrlounge.com/remove-banding-photoshop/

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Community Expert ,
Jun 06, 2017 Jun 06, 2017

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This is called "banding" and you use Photoshop's noise filters to reduce it.

https://www.slrlounge.com/remove-banding-photoshop/

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New Here ,
Jun 06, 2017 Jun 06, 2017

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Thank you gener7!

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Community Expert ,
Jun 06, 2017 Jun 06, 2017

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Thanks for letting me know.

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Community Expert ,
Jun 07, 2017 Jun 07, 2017

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That background gradient is as near B&W as makes no difference. If you toggle through all three channels, you'll see no difference in any of them regards the background.   That effectively cuts your available steps fro 256x256x256 to just 256, so you need to work in 16 bit.  Actually, while I say this applies to B&W, it is true of any image where just one channel is active, like with a subtle gradient in a blue sky. 

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