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

Started 2 months ago | Discussions thread
decaf14 Regular Member • Posts: 234
Re: How Do I Measure Noise Using Photoshop? And What Is A Significant Change?

Noise is what we define it as. You have to know what you want in the image to know what you don't want.

Typically we remove "noise" by using a digital low pass filter. You could then quantify noise by examining the amount of high frequencies in an area of your photo you expect to be a single color. You could do this in MATLAB.

At a physical level, it's much easier to quantify. Typically, a transistors dark current (current when no light is shining) determines it.

I'm sure there are other metrics we use for noise that are far more clever than looking at a fourier, but I don't know them off the top.

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