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

Started 2 months ago | Discussions thread
57even Forum Pro • Posts: 14,107
Re: How Do I Measure Noise Using Photoshop? And What Is A Significant Change?

tbcass wrote:

57even wrote:

tbcass wrote:

57even wrote:

It depends which raw processor you use. This is not a product of the sensor, only the software you use to demosaik it. Adobe, C1 and Silkypix have different default noise levels, and all add sharpening and NR to the data.

But the JND is the same, whatever. So, if the noise level is 0.8%, increasing it by 1dB to 0.9% should be noticeable.

You missed my point. If 2 images have the same noise but the noise characteristics are different then the results after noise reduction may not give equal results. This is regardless of the noise reduction method used.

I would think it very unlikely that the same NR settings would work for two unrelated images, any more than sharpening would.

Never mind. You don't understand and I'm not going to waste my time explaining it to you any more.

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.

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