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Hi Gene- Actually, my understanding is that it's the opposite- that is, when the histogram extend all the way out to 0 and 255, with no slope, but with an abrupt or no cut-off, then the assumption is that data above and below those points have been compressed, or clipped. Basically what you want to see is a curve that sloped down to the ends, and "dies" between 1-5 and 250-254, respectively. Hope that's clear- Bill Morse PhotoProspect Cambridge, MA 02139 on 4/5/02 2:14 PM, Gene DeVol wrote: > I've been following this group for about three months now, and have found it > to be very educational. > > I have a question. Frequently, I see references to "clipping." Does that > refer to a histogram that does not extend completely to either end of the > scale, "0" at the shadow end, "255" at the highlight end? I have a Nikon > SuperScan 4000, and I often see voids on both ends of the histogram. > Recently, I have been scanning some Fuji Provia 100 slides - there, the void > is mostly confined to the shadow side. > > Any insight would be appreciated in terms of defination, causes, fixes etc. > > Regards, Gene > > - > Turn off HTML mail features. Keep quoted material short. Use accurate > subject lines. http://www.leben.com/lists for list instructions. - Turn off HTML mail features. Keep quoted material short. Use accurate subject lines. http://www.leben.com/lists for list instructions.