Interesting video on histograms. I learned a lot. Thanks. Now trying to apply it to scanning, I still have questions. I adjust the levels sliders on Epsonscan to expand the range of the prescan. (I scan at 16 bits grayscale for BW film and 48-bit color for chromes). So if let's say the image runs from 20-210 on the Epsonscan pre-scan, I set black and white levels arrows to 15 and 215. What should I do with the Output settings if 0-255 is counterproductive? Set them to the same that I set the input: 15 and 215 in this case so they match? Something else? As a separate procedure, does it make sense to just scan "flat" and do all the level adjustments in Lightroom? I've tried it this way and haven't noticed the difference. But someone said I lose data this way. Is that true?