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Luminous Landscape Artikel.

Auszug:

[...]In order to display the full dynamic range of your camera in the histogram displayed on the back, you must set the contrast to minimum. You now can see the same dynamic range in the histogram on the camera as you will see it in your RAW processor on your computer.

When shooting RAW always set the contrast to minimum so that the histogram displays the full dynamic range the camera can capture. This makes for rather dull images on the back of your camera, but gives you better information about exposure and clipping.
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I'll simply add to what Ray has written that it is also important that you set the colour mode to Adobe RGB, rather than sRGB – if your camera allows this, and for the same reasons. The same applies to White Balance (get it right), contrast, saturation and tint. In other words all of the JPG settings that your camera allows but which are irrelevant for raw. They simply make the camera produce an inaccurate histogram.