Ad
Ad
Ad
Pages: [1]   Bottom of Page
Print
Author Topic: ACR and noise reduction ?  (Read 4555 times)
Go Go
Full Member
***
Offline Offline

Posts: 133


WWW
« on: June 25, 2014, 02:33:44 PM »
ReplyReply

Working with files from a 5DIII shot at base, 160, 320, 640, and 1250 ISO.
Do you have any suggestions for setting in the Noise Reduction sliders?
Luminance, Luminance Detail. Luminance Contrast, Color, and Color Detail?
Logged

Slobodan Blagojevic
Sr. Member
****
Online Online

Posts: 6295


When everybody thinks the same... nobody thinks.


WWW
« Reply #1 on: June 25, 2014, 02:42:40 PM »
ReplyReply

You could select it in Preferences (see the attached file), but, otherwise, I rely on my own visual preference on a case-by-case basis.
Logged

Slobodan

Flickr
500px
Go Go
Full Member
***
Offline Offline

Posts: 133


WWW
« Reply #2 on: June 25, 2014, 03:09:04 PM »
ReplyReply

Thank you.
I have been seeing a lot of files that look better without any Luminance (slider zeroed).
I thought that I might ask here, about how others are using the NR sliders in ACR?
Logged

Denis de Gannes
Jr. Member
**
Online Online

Posts: 71



« Reply #3 on: June 25, 2014, 05:09:53 PM »
ReplyReply

A good place to start, have a look at the thread below.
http://jpskytechmedia.wordpress.com/2013/07/12/principal-scientist-and-mad-man-eric-chan-discusses-his-role-in-improving-photoshop/
Logged

Equip: Win 7, Core 2 Duo 2,600 Mhz, 4GB Ram, HDD internal 500GB;320GB & 1TB, Ext 1 TB Seagate; Canon InkJet Pro9000; Dimage Scan Elite 5400.
Imaging Software: LR 5.7; PS CS6; Capture One 7; Qimage.
Cameras: Olympus OMD E-M1; E300; Panasonic G3.
Tim Lookingbill
Sr. Member
****
Offline Offline

Posts: 1264



WWW
« Reply #4 on: June 25, 2014, 05:33:54 PM »
ReplyReply

Thank you.
I have been seeing a lot of files that look better without any Luminance (slider zeroed).
I thought that I might ask here, about how others are using the NR sliders in ACR?

I'm editing ISO 800 PEF's off a 2006 Pentax 6MP DSLR viewed at 100% in LR4/CS5. The shadows are noisy as hell but I found the combinations of Luminance Detail and Contrast sliders REALLY do work hand in hand with the sharpening settings. I thought these Lum sliders didn't do anything until I took quite a bit of time seeing exactly what they do to noise viewed at 100% and can now profess I've been doing it wrong because these sliders act on the pixels so subtly that if you don't take the time on an image by image basis you'll miss how well they work.

But if your camera doesn't have that much noise shooting at high ISO maybe it's not worth the time.
Logged
Theodoros Papageorgiou
Newbie
*
Offline Offline

Posts: 4



WWW
« Reply #5 on: June 26, 2014, 07:51:34 AM »
ReplyReply

Good question, I too wonder how others are using Noise Reduction in ACR.

However, do you really need noise reduction for 640 or lower ISO with Canon 5DIII images?

For 1000 and higher ISO I've found that a Luminance setting of ~25 with Luminance detail 50 works well with portraits, the skin looks smooth.
Logged

digitaldog
Sr. Member
****
Offline Offline

Posts: 9315



WWW
« Reply #6 on: June 26, 2014, 10:28:04 AM »
ReplyReply

i used Slobodan's technique of building a group of presets per ISO as a starting point. But then I'll season to taste on hero images, always viewing at 100% (1:1).
Logged

Andrew Rodney
Author “Color Management for Photographers”
http://digitaldog.net/
Tim Lookingbill
Sr. Member
****
Offline Offline

Posts: 1264



WWW
« Reply #7 on: June 26, 2014, 07:22:09 PM »
ReplyReply

I find the Contrast and Detail Luminance slider provide a sort of micro-Clarity effect to shadow detail maintaining smoothness to the dithered noise especially in skin texture in shadows.

My setting of 50 Detail would create a weird swirly texture to upper shadow detail and so I set Detail to about 25 and upped the Radius to 2 which reduced fine crispy dithered noise and punched up edge sharpness without halos.

I'ld have to assume this works on my 6MP image but I doubt those settings will work on higher rez captures. The Contrast Lum slider actually brought out the local contrast in the shadow detail just like old PV2003-2010 Clarity but with a much more narrower radius. It almost acted like a sharpening adjust.

The delay (almost 6 seconds) in the preview updating viewed at 100% when adjusting these sliders was what prevented me all this time from seeing the benefits of its use.
Logged
rovanpera
Jr. Member
**
Offline Offline

Posts: 70


« Reply #8 on: June 26, 2014, 07:38:17 PM »
ReplyReply

It's always good to check visually at 100%.

Noise can show up on ISO100 or ISO200 shots from extreme corrections - big exposure moves, lifting the shadows, adding a lot of contrast etc.
Logged
Schewe
Sr. Member
****
Offline Offline

Posts: 5542


WWW
« Reply #9 on: June 26, 2014, 10:59:02 PM »
ReplyReply

Not for nothing, but you can't talk about noise reduction only without also talking about sharpening...noise reduction and image sharpening are two side of the same coin. As you increase either, you must increase/adjust the other. I guess that's why so many people struggle when simply trying to adjust one set of numbers or the other.

Increasing high frequency sharpening means you need to adjust luminance noise reduction...generally higher unless you are starting from zero.

At some point there will be an optimal combination of both sharpening and noise reduction to get a specific image "perfected". Yes, there are generalities...but to try to arrive at specific numbers really needs to be applied based on specific cameras at specific ISO's and the types of images being adjusted...

Sorry, there are no simple and easy answers...you need to learn the controls (and what they do) and trust your eyes to see what's happening...and I often adjust sharpening and noise at 200% or 400% to see what's happening to the pixels....
Logged
Go Go
Full Member
***
Offline Offline

Posts: 133


WWW
« Reply #10 on: June 30, 2014, 07:18:00 AM »
ReplyReply

Thanks for the replies, I appreciate it.
Logged

Rajan Parrikar
Sr. Member
****
Offline Offline

Posts: 884



WWW
« Reply #11 on: July 11, 2014, 06:13:33 PM »
ReplyReply

On a related note, going through Martin Evening's (excellent) book "Photoshop CC for Photographers" I found his discussion of the Detail slider within the Detail panel of ACR a little wanting.  Martin E writes that "The Detail slider suppresses the halo effects in the image. It allows you to increase the Amount sharpening but without generating too noticeable halo edges in the image."  Later he cites Eric Chan as someone who uses +100 Detail on his low ISO landscape images.

My understanding was that the Detail slider activates the deconvolution algorithm but Martin E doesn't say so explicitly and I feel he has muddied the waters somewhat.

Overall, a superb treatment, one that I highly recommend.

Logged

Tim Lookingbill
Sr. Member
****
Offline Offline

Posts: 1264



WWW
« Reply #12 on: July 11, 2014, 08:55:45 PM »
ReplyReply

On a related note, going through Martin Evening's (excellent) book "Photoshop CC for Photographers" I found his discussion of the Detail slider within the Detail panel of ACR a little wanting.  Martin E writes that "The Detail slider suppresses the halo effects in the image. It allows you to increase the Amount sharpening but without generating too noticeable halo edges in the image."  Later he cites Eric Chan as someone who uses +100 Detail on his low ISO landscape images.

My understanding was that the Detail slider activates the deconvolution algorithm but Martin E doesn't say so explicitly and I feel he has muddied the waters somewhat.

Overall, a superb treatment, one that I highly recommend.



Are you referring to Eric's 100% Detail in the noise section or sharpening section? If you're referring to the Luminance Noise slider section, 100% Detail creates a swirly texture for my 6MP PEFs viewed at 100% and I either have to dial back that slider or increase Sharpening Radius to like say 1.5 to 2.0. I would suspect higher resolution Raw files which I'm assuming Eric applies this setting would hide or make it hard to see this swirly texture at that zoom view.

But thanks for that tidbit from Eric.
Logged
Rajan Parrikar
Sr. Member
****
Offline Offline

Posts: 884



WWW
« Reply #13 on: July 11, 2014, 10:47:27 PM »
ReplyReply

I was referring to the Detail slider in the Sharpening section.
Logged

xpatUSA
Sr. Member
****
Offline Offline

Posts: 305



WWW
« Reply #14 on: July 12, 2014, 07:09:55 PM »
ReplyReply

I have been seeing a lot of files that look better without any Luminance (slider zeroed).
I thought that I might ask here, about how others are using the NR sliders in ACR?

May not apply to your camera, but ACR 5.4 applies some NR even when both sliders are zeroed.

For my Sigma cameras:

dcraw V9: none
Sigma Photo Pro 3.5: a bit
ACR 5.4: quite a lot

FWIW
Logged

best regards,

Ted
Pages: [1]   Top of Page
Print
Jump to:  

Ad
Ad
Ad