I have taken pictures of a little burn (stream) at side of a wall. The green of the foliage, with the darkness of the water and the paleness of the stonework in the wall produce a good average contrast image.
I have take pictures across a wide exposure and show three examples below with associated histograms.
Average exposure.
Over exposure by approx -1 stop.
Under exposure by approx +1stop.
As can be seen as the exposure lengthens and more light falls upon sensor, the resultant histogram shifts towards the right . As the picture has no clipping moving the exposure in this way does not make the exposure too black nor too white, although changing exposure by more than 1 stop would start to produce clipping as seen in previous examples.
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