The tone reproduction chapter in The Theory of the Photographic Process 3rd edition covers both objective and subjective tone reproduction in great detail. Along with the mid-tone gradient, one other critical condition is required. The print tones need to be lighter than the original subject.
Here's an example of a four quadrant reproduction curve. The upper right quadrant is the actual reproduction curve. It compare the original subject with the resulting print.
Normal four quad.jpg
And here's one that shows the effects of extended processing to compensate on underexposure has on the reproduction curve.
Tone Reproduction - Underexpose.jpg
Last edited by Stephen Benskin; 03-06-2013 at 08:04 PM. Click to view previous post history.