Exposure basics, lesson two point one (& ISO)

Started Mar 19, 2013 | Discussions thread
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Timur Born
Timur Born Senior Member • Posts: 4,606
Re: Exposure basics, lesson two point one (& ISO)
There is an assumption that the image is in sRGB with a standard 2.2 Gamma (as modified by sRGB) but we all know that different manufacturers adopt different tone curves for their default jpegs - olympus for instance are particularly contrasty - so, you can set the 18% grey point,

Since sRGB doesn't use an exact Gamma of 2.2, but a pushes dark shadows slightly compared to a pure 2.2 curve I just ask myself whether 18% gray is on the 2.2 part of the curve or still on the pushed part?

I suspect it's on the 2.2 part, because the pushed part really is way left on the histogram. Never a bad idea to ask when one is not sure.

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