[Added after the original post. Eric Chan has informed me that there are two image-processing pipelines in Lightroom: output-referred, and scene-referred. Raw files get the scene-referred pipeline. Integer TIFFs get the output-referred pipeline. Therefore, the TIFF test images are getting a different set of processing than LR applies to raw files.]
Bill Janes suggested that I run the Lightroom Exposure control tests with PV 2010 (the way the control worked in Lightroom 3.x). Here are the results in 2D first, and then 3D.
The baseline image with all processing stages, and an Exposure value of 0:
EV -1:
EV -2:
EV -3:
EV -4:
The baseline image with all processing stages, and an Exposure value of 0:
EV -1:
EV -2:
EV -3:
EV -4:
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