ACR noise reduction

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nzgmw
Member is a Bronze contributor and has 250 - 2,499 Photo downloads
Posted Thu Apr 5, 2012 2:56PM
I have a good modern camera (Nikon D7000) and I always shoot low ISO (100).  But on sunny days I inevitably end up with some noise when shooting  cloudless blue skies.  I recently discovered the noise reduction tools in Adobe Camera Raw.  The Luminance slider appears to be a quick and easy way of reducing and even eliminating noise from blue skies.  Would others recommend this tool?  Are there any disadvantages?  I've been setting mine at around the 40 mark.
erniedecker
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Posted Fri Apr 6, 2012 8:53PM
Since no one has answered you I'll give you my 2 cents worth.... With a D7000 and at ISO 100 I don't see how you're getting any noise if you have a decent exposure. I use Lightroom, but it's the same processing engine as ACR, so the controls are practically idetical. Yes the noise reduction is very good, especially in latest versions, but I think 40 is way too high. The more noise reduction you use the more it affects sharpness. Since you're shooting raw I would add exposure first and then noise reduction in small amount. But again, I don't see why you would need it.
Whiteway
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Posted Sat Apr 7, 2012 2:13AM
It might be an idea to offer up a link to a full-sized (watermarked) version via the Critique forum. Then we can judge better what the problem is.
Feverstockphoto
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Posted Sat Apr 7, 2012 3:24AM
All digital cameras will produce noise, some more than others regardless of the iso settings. It can be seen in those clear blue skies even at lowest iso settings especially deep blue skies or images that have deep shadows, or underexposed images that you later correct exposure in software will bring out the noise more. With your camera at 100 iso images should be acceptable on Istock with none or minimal noise reduction if taken/exposed correctly. Colour noise can be more of an issue on Istock than luminance as has been mentioned by admins in the past. ACR is great when used correctly for a given image you are working on although i prefer Topaz DeNoise myself . Other programs such as Nik allow targeted/selective noise reduction to particual areas like sky, this can also be done by masking in Photoshop using layers/masks.... Some good tutorials on using these programs can be found on Youtube.
nzgmw
Member is a Bronze contributor and has 250 - 2,499 Photo downloads
Posted Sat Apr 7, 2012 2:58PM
Posted By Whiteway:
"It might be an idea to offer up a link to a full-sized (watermarked) version via the Critique forum. Then we can judge better what the problem is." 







Thanks.  Happy to do this.  Could someone explain how I make a sample photo available for viewing.



(Edited on 2012-04-07 14:59:11 by nzgmw)

(Edited on 2012-04-07 15:28:08 by nzgmw)
slobo
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Posted Sat Apr 7, 2012 3:14PM
Posted By nzgmw:

Thanks.  Happy to do this.  Could someone explain how I make a sample photo available for viewing.



Read here
nzgmw
Member is a Bronze contributor and has 250 - 2,499 Photo downloads
Posted Sat Apr 7, 2012 3:30PM
The query has now been posted in Critique and the sample image can be see here.
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