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Noise in Some Photos

Forum|Forum|3 years ago
June 1, 2023
5 replies
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I am trying to figure out the source of noise in some of my images.

The attached images where shot a heartbeat apart on a Sony a1 on manual with a remote trigger. The orginal files are RAW. All perameters are exactly the same. Their histograms look exactly the same. I expected noise at ISO 8000. ( Sony 90mm f5.0 1/3200 sec. ) No Flash. They were uploaded to Lightroom Classic 12.3 at the same time. The development choices were cut and paste. I can not remember which one I did first, or which of a number of images was the source. My question is, why the huge difference in noise?

Windows

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Correct answer dj_paige

In one photo, the color noise slider is set to 25. In the other photo, the color noise slider is set to 0.

Dan PerryAuthor

Known Participant

I think I have Dropbox sorted out. This is a link to the RAW files.

https://www.dropbox.com/sh/evro79ye9v47y4d/AADNTigCV9MJgnf-14fPaQq8a?dl=0

dj_paigeCorrect answer

Legend

In one photo, the color noise slider is set to 25. In the other photo, the color noise slider is set to 0.

Keith Reeder

Participating Frequently

Where can you see this, DJ?

dj_paige

Legend

Is the Detail panel turned off in one of the photos (the one with the more noise)?

D Fosse

Community Expert

It is not possible to conclude with anything here until we see a 100% view of both.

100% is a significant number. It means one image pixel is represented by exactly one physical screen pixel. It's the only way to see the pixel structure accurately.

The two shots are taken with the same aperture, so if there's any real difference, it would have to be shutter speed bracketing.

D Fosse

Community Expert

I have to ask: why would you choose to learn photography basics on an a1? The Sony alphas are incredibly complex cameras that can be customized to do anything by pushing any button. There's no limit to what can happen if you push the right - or wrong! - button.

Dan PerryAuthor

Known Participant

I studied photography long before digital. I didn't like the work flow or darkrooms, so I didn't stick with it. Then I spent years in the movie industry looking over the shoulders of some of the great DOPs of the world. Soon their choices became extremely perdictable.

I like all things digital. When I retired I got back into photo I picked up a Sony a7iii. I love photographing wildlife, night skys etc. in remote wilderness locations and I felt an A1 would serve me better.

Generally I think I know which buttons to press, but I'm still learning.

TheDigitalDog

Inspiring

Can you upload the raws to something like Dropbox or similar so we can examine them each?

FWIW, ISO has nothing to do with noise. The relative amount of noise changes with exposure. Underexposure leads to more noise; not ISO.

Author “Color Management for Photographers" & "Photoshop CC Color Management/pluralsight"

Dan PerryAuthor

Known Participant

I will look into how to use Dropbox. And thank you for the note on ISO. I am fairly new to photography. Still learning. Could you refer me to a source where I could look futher into ISO?

TheDigitalDog

Inspiring

I will look into how to use Dropbox. And thank you for the note on ISO. I am fairly new to photography. Still learning. Could you refer me to a source where I could look futher into ISO?

By @Dan Perry