More airport fog

TonyTurley · 06-13-2014, 09:13 AM

Even at f/4, there's still some noise in the RAW files coming from the Q +01. I've spent a fair bit of time over the past few days tweaking my work flow with RawTherapee and GIMP. These are much improved, IMO.

Steve.Ledger · 06-13-2014, 11:24 AM

Originally posted by TonyTurley

Even at f/4, there's still some noise in the RAW files coming from the Q +01.

Aperture has nothing to do with the noise levels, Tony.
As EXIF is stripped from your photos I can't tell the ISO you used. The ISO sensitivity is where you control the noise levels best.

CFWhitman · 06-13-2014, 12:02 PM

Yes, the wider aperture suggestion was to make the pictures sharper because there would be less light diffraction (which affects image quality much sooner on small sensors). The only indirect way it could have an effect on the noise would be if you were able to set your ISO lower because of using a wider aperture. The lower you set your ISO the less noise you should generally have (of course underexposing and pushing the exposure during post processing could also lead to some noise).

TonyTurley · 06-13-2014, 02:55 PM

I used ISO125. Some noise was still visible in the RAW files before I ever touched them. Still a head scratcher to me.

hnikesch · 06-14-2014, 06:59 AM

Nice shots Tony, as for noise I use Lightroom and mask the sky when sharpening to avoid sharpening the noise, the noise reduction in LR also works quite well as does the RAW developing. Having said that any exposure adjustments you make in PP can increase the appearance of noise, you might try bracketing the fog shots and pick the best exposure rather than adjusting them is post. I have used RawTherapee and found it difficult to get the results I can get with LR processing RAW files. I am mostly a jpeg shooter and only use RAW when in a very difficult lighting situation.

jethro10 · 06-14-2014, 10:24 AM

Originally posted by Steve.Ledger

Aperture has nothing to do with the noise levels, Tony.
As EXIF is stripped from your photos I can't tell the ISO you used. The ISO sensitivity is where you control the noise levels best.

I also use rawtherapee and gimp. Rawtherapee strips exif, no idea how to stop it!
J

TonyTurley · 06-14-2014, 10:48 AM

I just did the basic RAW processing on those with RawTherapee, then opened them in GIMP to adjust the levels, a slight Gaussian blur adjustment, followed by mild sharpening. There may be better routines, but that worked fairly well this time.

Steve.Ledger · 06-14-2014, 12:43 PM

Originally posted by jethro10

Rawtherapee strips exif, no idea how to stop it!
J

Doesn't for me.
Using 4.1.1

---------- Post added 06-15-14 at 05:46 AM ----------

Originally posted by TonyTurley

I used ISO125. Some noise was still visible in the RAW files before I ever touched them. Still a head scratcher to me.

Yes, in fact you will often see much more noise in RAW than in-camera processed JPG because, well it's RAW

TonyTurley · 06-14-2014, 06:03 PM

Originally posted by Steve.Ledger

Doesn't for me.
Using 4.1.1

Time to update. I'm using 4.0.12.

06-13-2014, 09:13 AM	#1
TonyTurley Veteran Member Join Date: Dec 2013 Location: Scott Depot, WV Posts: 1,240	More airport fog Even at f/4, there's still some noise in the RAW files coming from the Q +01. I've spent a fair bit of time over the past few days tweaking my work flow with RawTherapee and GIMP. These are much improved, IMO.

06-14-2014, 12:43 PM	#8
Steve.Ledger Veteran Member Join Date: Oct 2009 Location: Far North Qld Posts: 3,301	Originally posted by jethro10 Rawtherapee strips exif, no idea how to stop it! J Doesn't for me. Using 4.1.1 ---------- Post added 06-15-14 at 05:46 AM ---------- Originally posted by TonyTurley I used ISO125. Some noise was still visible in the RAW files before I ever touched them. Still a head scratcher to me. Yes, in fact you will often see much more noise in RAW than in-camera processed JPG because, well it's RAW Last edited by Steve.Ledger; 08-10-2014 at 10:12 PM.

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06-13-2014, 11:24 AM	#2
Steve.Ledger Veteran Member Join Date: Oct 2009 Location: Far North Qld Posts: 3,301	Originally posted by TonyTurley Even at f/4, there's still some noise in the RAW files coming from the Q +01. Aperture has nothing to do with the noise levels, Tony. As EXIF is stripped from your photos I can't tell the ISO you used. The ISO sensitivity is where you control the noise levels best.

06-13-2014, 12:02 PM	#3
CFWhitman Senior Member Join Date: Jan 2007 Location: Upstate New York, US Photos: Albums Posts: 225	Yes, the wider aperture suggestion was to make the pictures sharper because there would be less light diffraction (which affects image quality much sooner on small sensors). The only indirect way it could have an effect on the noise would be if you were able to set your ISO lower because of using a wider aperture. The lower you set your ISO the less noise you should generally have (of course underexposing and pushing the exposure during post processing could also lead to some noise).

06-13-2014, 02:55 PM	#4
TonyTurley Veteran Member Join Date: Dec 2013 Location: Scott Depot, WV Posts: 1,240 Original Poster	I used ISO125. Some noise was still visible in the RAW files before I ever touched them. Still a head scratcher to me.

06-14-2014, 06:59 AM	#5
hnikesch Veteran Member Join Date: May 2009 Location: Michigan, USA Photos: Albums Posts: 1,316	Nice shots Tony, as for noise I use Lightroom and mask the sky when sharpening to avoid sharpening the noise, the noise reduction in LR also works quite well as does the RAW developing. Having said that any exposure adjustments you make in PP can increase the appearance of noise, you might try bracketing the fog shots and pick the best exposure rather than adjusting them is post. I have used RawTherapee and found it difficult to get the results I can get with LR processing RAW files. I am mostly a jpeg shooter and only use RAW when in a very difficult lighting situation.

06-14-2014, 10:24 AM	#6
jethro10 Senior Member Join Date: Nov 2013 Location: Lake District Posts: 222	Originally posted by Steve.Ledger Aperture has nothing to do with the noise levels, Tony. As EXIF is stripped from your photos I can't tell the ISO you used. The ISO sensitivity is where you control the noise levels best. I also use rawtherapee and gimp. Rawtherapee strips exif, no idea how to stop it! J

06-14-2014, 10:48 AM	#7
TonyTurley Veteran Member Join Date: Dec 2013 Location: Scott Depot, WV Posts: 1,240 Original Poster	I just did the basic RAW processing on those with RawTherapee, then opened them in GIMP to adjust the levels, a slight Gaussian blur adjustment, followed by mild sharpening. There may be better routines, but that worked fairly well this time.

06-14-2014, 06:03 PM	#9
TonyTurley Veteran Member Join Date: Dec 2013 Location: Scott Depot, WV Posts: 1,240 Original Poster	Originally posted by Steve.Ledger Doesn't for me. Using 4.1.1 Time to update. I'm using 4.0.12.

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