Help with ISO

Started May 15, 2013 | Discussions thread
HumanTarget Senior Member • Posts: 1,626
Re: Help with ISO

sjgcit wrote:

Analogue gain is not always applied these days.  I think some sensors apply ISO as a digital multiplication ( which is how software does it ).  The difference is that the sensors apply it on the raw sensor data directly, but some cameras do not store the full bit depth in RAWs ( e.g. a sensors captures in 14 bits, but the the RAW may only store 12 bits - still plenty, but not exactly what the sensor counted ).

It can get confusing, since the ISO standard is about mapping exposure index values to tone values, and there are lots of ways manufacturers can do that, and they don't need to specify what they're doing.

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