A rather odd exercise given that we are told about something we do not see at any time given that the camera and computer screen carry out the process automatically.
Creating the curve as shown in the exercise material does indeed darken the image and, as expected, the histogram shows that there is a shift to the left because the image is dominated by the dark tones. Applying the opposite curve as shown on p 15 does indeed restore the image almost back to the original jpeg image. I say 'almost' because there were some very slight differences in toning at the extremes but this may well have been due to slight inaccuracies in the creation of the curve.
I remain perplexed by the purpose of this exercise as I cannot see when it would be of direct use.
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