Why 'more or less stopped using ISO'?

Started Feb 19, 2014 | Questions thread
D Cox Forum Pro • Posts: 21,849
Re: Why 'more or less stopped using ISO'?

bobn2 wrote:

D Cox wrote:

Iliah Borg wrote:

D Cox wrote:

Iliah Borg wrote:

Brightening can be applied only to an image. Raw is not an image.

A digital image (as opposed to a film or a print) is an array of numbers with X, Y coordinates representing brightness levels at each point.

No, not brightness.

OK, how about "amount of light" ?

No, I think "brightness" is the correct word.

Brightness is a relative thing, because the eyes adapt to the amount of light.

Yes, it is largely the relative brightness of different parts of the image that we are concerned with. Also, those values relative to the surround of the image.

What matters are the order of image patches from dark to light, and the intervals between them.

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