Why 'more or less stopped using ISO'?

Started Feb 19, 2014 | Questions thread
jackdan Contributing Member • Posts: 896
Maybe this will help.

Iliah Borg wrote:

D Cox wrote:

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.

But with spectral sensitivities very different from what a has sensor. Brightness is matched to humans, not to camera sensors.

There is a stream of numbers going through from the photodetector to the print.

They are going through human intellect

The brightness of a patch on the print derives from those numbers.

In many different ways, depending on many design and perception factors. As you can't make a universal formula translating the numbers to the brightness there is really nothing we can do.

Federal Standard 1037C, the Federal Glossary of Telecommunication Terms (1996)

brightness: An attribute of visual perception in which a source appears to emit a given amount of light.Note 1: "Brightness" should be used only for nonquantitative references to physiological sensations and perceptions of light. Note 2: "Brightness" was formerly used as a synonym for the photometric term"luminance" and (incorrectly) for the radiometric term "radiance."

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