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Noise reduction color chanels

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Ali Quintana
Noise reduction color chanels
on Feb 8, 2016 at 4:31:24 pm

is there a way to noise reduce only color channels? and sharpen luma Chanel?


I have a davinci resolve background where we split the rgb from the luma channels, then see each color channel and apply noise reduction only to the collor channels needed, then we sharpen the luma channel only.

Now thast for video of course, but now I am editing a photo, in PS, would love to know if this technique can be done in PS?


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Kalle Kannisto
Re: Noise reduction color chanels
on Feb 8, 2016 at 5:38:43 pm

Yes, duplicate your layer and set the top one to luminosity blend mode.

Then you can do noise reduction on the bottom layer, or even surface blur it or something similar, and the top layer will maintain the luminosity details.


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Ali Quintana
Re: Noise reduction color chanels
on Feb 8, 2016 at 8:01:01 pm

and can i separate the red green and blue Chanel as well?

I saw many tuts on noise red in PS, but this technique is never mentioned. Will this work great with PS as well??


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Kalle Kannisto
Re: Noise reduction color chanels
on Feb 9, 2016 at 9:29:54 pm

Red and blue (and green) channels are already separate. You can select one in the channels palette and apply an effect to just that one channel.


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Ali Quintana
Re: Noise reduction color chanels
on Feb 10, 2016 at 10:51:06 pm

Thank you,

What would be the best noise reduction effect to use to the separate color channels?

I heard about High Pass?


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Kalle Kannisto
Re: Noise reduction color chanels
on Feb 11, 2016 at 11:47:40 am
Last Edited By Kalle Kannisto on Feb 11, 2016 at 11:50:35 am

In my experience surface blur followed by a small gaussian blur does a decent job.

Highpass does something quite different, an edge detection of sorts. It is of more use in sharpening rather than blurring.


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Ali Quintana
Re: Noise reduction color chanels
on Feb 11, 2016 at 4:25:46 pm

thank you, yes sorry, i was confused, the high pass for sharpening.

I can use that high pass on the luma channel then?


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Kalle Kannisto
Re: Noise reduction color chanels
on Feb 11, 2016 at 6:36:23 pm

Unsharp Mask does pretty much the same thing, but it is faster and easier to adjust, and you have more control on the outcome with the threshold setting.

(To use highpass, you'd have to make a copy of the luminosity layer and blend the highpass layer with the luminosity layer.)


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