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Strange Scaling of Colors

So I've made some progress by setting:

use_auto_wb = 1
no_auto_bright = 1
bright = 0.8

But I think the auto scaling is having some issues scaling the channels correctly. I think it's probably because the upper and lower bounds of each channel were calculated with the un-inverted negative?

This is the original histogram from RawDigger:

...and this is the histogram from the generated TIFF from Rawtherapee:

Is there a good way to have libRaw recalculate the per-channel min and max, or alternatively, to set them manually?