Why 'more or less stopped using ISO'?

Started Feb 19, 2014 | Questions thread
D Cox Forum Pro • Posts: 21,584
Re: Why 'more or less stopped using ISO'?

bobn2 wrote:

edhannon wrote:

There are three places that brightening can be applied:

  • With amplification between the sensor andq analog to digital conversion (e.g. Pentax *ist line)

That doesn't apply any 'brightening', it just makes the voltage representing a particular photo-electron count bigger.

Which will give a larger number when digitised, which will give a brighter image.

  • By using more bits in the analosg to digital conversion than are used in raw output file then bit shifting in firmware (e.g. Pentax K10)

That doesn't apply any brightening, it just changes the code used to represent a particular photoelectron count.

  • By processing the raw data either in camera or in the raw converter.

That is the only time 'brightness' is established.

This and the last are both simple operations on the numbers. You are making a false distinction.

The last one uses cheaper hardware but results in loss of effective bit depth.

Only the last one is brightening.

In which case your use of the word "brightness" is not helpful for understanding digital photography.

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