Carry Lightroom's tone sliders across at measured strengths

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Contrast2012 and the four recovery sliders were imported one to one. They do
not mean the same thing here: fitted on the library's Lightroom 6 exports and
their raws — each photograph's sliders carried across as slider × factor, one
factor per slider, on about 90 exports with no look applied, on the Camera Raw
default rendering — ours needed contrast at about a tenth (Lightroom's −100
imported as ours flattens a frame to grey), highlights ×1.4, shadows ×1.9 and
blacks ×1.25. Whites fitted below 1 every time without agreeing where; 0.5 is
a hedge, and says so. Vibrance stays one to one: the op itself is now
calibrated to Lightroom's.

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dtourolle

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