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Originally Posted by Stephen Fox
Ollie, you are not strictly setting the black point incorrectly but Don is showing the use of black and white control points. These control points have the same effect of what you are doing but they are much faster and with the aid on double threshold allow the find a suitable black area.
I suggest looking again at black and white control points in post 28
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Ollie,
I do not use your method in levels and curves as it is a rather coarse way of doing it. Maybe even a bit hit and miss. The method described in post 28 is far more precise and you have the added benefit of the control handle so allowing a high degree of adjustment.
You can compare the two methods by firstly checking the ' Double threshold ' box on your straight image and taking a screen capture. Now uncheck the ' double threshold ' box and apply the adustment using the droppers in curves. Again check the ' double threshold ' box and take another screen capture. You can now compare the two captures to see how much you have affected the black and white tones.
Don