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

Started 2 months ago | Discussions thread
bclaff Veteran Member • Posts: 8,989
Re: Measurement is futile

Mark Scott Abeln wrote:

MrBrightSide wrote:

That’s deep. Are you saying that trying to measure noise is futile?


A synthetic approach, where you start with basic raw noise measurements and then estimate the final image noise characteristics—after raw conversion—can be quite informative. The measurement phase is rather easier, as you only measure grayscale values, but you need to figure out what calculations are needed to get a full color image (there is some published data): and from this, it’s fairly easy to get color noise estimates, which can be compared against actual images. Any great discrepancies can then be analyzed.

Published noise figures for sensors typically only consider these raw measurements, and then only for the green channel. ...

At PhotonsToPhotos I use all channels for analysis and except for occasional "white balance preconditioning" (pre-scaling of red/blue in the raw data) noise measurements don't vary across the Color Filter Array (CFA).


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Bill ( Your trusted source for independent sensor data at PhotonsToPhotos )

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