How Do I Measure Noise Using Photoshop? And What Is A Significant Change?

Started 2 months ago | Discussions thread
57even Forum Pro • Posts: 14,108
Re: How Do I Measure Noise Using Photoshop? And What Is A Significant Change?

Sorry, I was distracted by your use of the word 'structure' which normally means patterns like banding or the wormy artefacts in Xtrans/Adobe raws.

Looking at DxOMark, the normalised ratings for each camera at a nominal ISO25600 are 18.5dB and 21.3dB, which is nearly 3dB or a full stop. 25600 is max ISO on the mkii, and tails off a lot. Still looks like a big difference, but mainly in the red channel. Other channels don't look that different.

tbcass wrote:

57even wrote:

I'm still waiting for you to explain what characteristics you are referring to.

Chroma vs luminance? Banding?

I have compared thousands of images from different cameras over the years, and as long as the images are not heavily processed (for instance if we use the default Adobe profiles) the noise structure is basically similar at a pixel level.

Here's a comparison between 2 sensors that according to DXO are within 1DB of each other but the noise characteristics are completely different.

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