Tonescale Graph from Scanner with dark scans

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https://omeka-s.library.illinois.edu/s/illinois-digitization/item/4632
Title
Tonescale Graph from Scanner with dark scans
Description
Here's an example from the testing results from our software. You can see where a neutral reproduction would be (the dotted line) and the curved line is the rendering that the settings on the scanner are producing. The dip represents the darkness we're seeing.