Why 'more or less stopped using ISO'?

Started Feb 19, 2014 | Questions thread
D Cox Forum Pro • Posts: 21,888
Re: Why 'more or less stopped using ISO'?

Iliah Borg wrote:

D Cox wrote:

Iliah Borg wrote:

The raw data are brightness values for the array of pixels.

Brightness is human perception. Measurements are not.

Except that human perception starts with measurement in the retina.

Arrays of pixels on the sensor do not have brightness because they do not emit or even reflect light. I do not see how loose definitions and terms help.

The number for each pixel specifies and determines the relative brightness of that pixel in the viewed image.


So what does ? Is the digital image irrelevant to the brightness of a patch on the print ?

There is a stream of numbers going through from the photodetector to the print. The brightness of a patch on the print derives from those numbers.

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