Can you explain this to me in laymen's language, please?

Started Oct 22, 2012 | Discussions thread
10s
10s
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Re: Can you explain this to me in laymen's language, please?
In reply to 10s, Oct 23, 2012

10s wrote:

With +2 stops of extra exposure you'll get 4x as much light on the sensor, pushing away the noise.

Oh yes, the tone curve (http://www.dpreview.com/reviews/canoneos7d/17) is also a factor. It is S shaped, and assuming the noise itself is constant in amplitude across the x axes, it depends on the signal you put into the curve how much it will become at the y axes. And as Karl Gntr Wnsch pointed out, sharpening will exaggerate the noise (especially with shadow noise if the sharpening is performed *after* the data went through the tone curve; when you afterwards sharpen JPEG images for example). In addition our eyes play tricks on us; measured noise differs from perceived noise (eg. in dark and bright areas).

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