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

Started 2 months ago | Discussions thread
Currantos Regular Member • Posts: 306
Re: Correction

Mika Y. wrote:

Currantos wrote:

Since most of the noise is in the light you capture, this proposed method won't show you most of the noise of a typical photograph.. It will only show you the small portion of noise that is added by the camera.

Not sure what you mean "noise in the light"?

Noise is only a property of the imaging system. It is not a property of the original object being imaged. There can be variations in value of the object being imaged but that is not noise.

Look at the black sky. Do you see bright noise, the white pixels? These are not noise, they are stars. That is what the astroguys are trying to take pictures of. Now take a look at their pictures. You will see both stars, the original "variations in the object" and the superimposed noise of the photo equipment.

To summarize. ALL of the noise in the photograph is from the camera(lens/sensor/etc). None is from the "light" that comes in.

Unless I'm mistaken, he means shot noise:

Correct, there is shot noise, not sure how that would play into the whole equation, sounds even more complicated now.

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