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Help, why does noise reduction create strange patterns?

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by James Vellozzi on Fri Aug 26, 2016 6:26 am

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Hello
I recently purchased Topaz De-noise 6 v6.0.1. The image below show what happens after the slightest noise reduction was applied. Note the image had no other post processing except for crop / size reduction. The image had noise reduction applied at an extremely low parameter (strength of .06). If you look, or zoom, especially in the lower left corner of the image you should see strange banding patterns. I am hoping someone here can help to explain this. How this be resolved?
thank you. James

James Vellozzi
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by Anthony Medici on Fri Aug 26, 2016 7:20 am

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I don't think noise reduction has anything to do with this. It looks more like you brought the image into photoshop as an 8 bit object and adjusted it causing the banding you are seeing. (Which is really all over the image, not just in the lower left corner.)

Was this a jpg to start with or was this a RAW file you were working with?

Tony

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by James Vellozzi on Fri Aug 26, 2016 7:50 am

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Anthony Medici wrote:I don't think noise reduction has anything to do with this. It looks more like you brought the image into photoshop as an 8 bit object and adjusted it causing the banding you are seeing. (Which is really all over the image, not just in the lower left corner.)

Was this a jpg to start with or was this a RAW file you were working with?

Anthony
I started in Photoshop with a TIFF image file. I shoot raw but convert them to TIFF files.
Thanks for further help

James Vellozzi
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by E.J. Peiker on Fri Aug 26, 2016 8:07 am

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Make sure when you do the RAW conversion to TIF, it is being converted in 16 bit mode not 8 bit mode. What are you using to do the RAW conversions and have you told it to do the conversions in 16 bit mode, default for many (like ACR) is 8 bit until you change it?

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by James Vellozzi on Fri Aug 26, 2016 9:19 am

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E.J. Peiker wrote:Make sure when you do the RAW conversion to TIF, it is being converted in 16 bit mode not 8 bit mode. What are you using to do the RAW conversions and have you told it to do the conversions in 16 bit mode, default for many (like ACR) is 8 bit until you change it?

E.J.
I use ACR, and I just looked. Its been doing conversions in the 8 bit mode.. I just changed it to 16 bit.
Oddly I thought I had always set it to 16 bit, is there any reason it would default back to 8 bit? Do I have to change it to 16 every time I say, turn the computer on/off or close / open Adobe camera raw?

If you would not mind, in jist, what is the difference between 8 vs 16 bit that I can understand?

thanks so much

JAmes

James Vellozzi
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by E.J. Peiker on Fri Aug 26, 2016 9:21 am

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No it's a sticky setting but a reinstall or an update by Adobe could have reverted it back to default.

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by Anthony Medici on Fri Aug 26, 2016 9:53 am

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