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

Started 2 months ago | Discussions thread
Mark Scott Abeln
Mark Scott Abeln Forum Pro • Posts: 14,344

The numbers from this technique would be more reliable if the image is first converted to a linear color space, otherwise the gamma correction would confuse the results.

Demosaicing, noise reduction, and conversion to JPEG changes the results as well, as does lens correction. While it may be important to know how these processes modify noise, it will make the results far harder to interpret well.

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