Archived posting to the Leica Users Group, 2005/05/23
[Author Prev] [Author Next] [Thread Prev] [Thread Next] [Author Index] [Topic Index] [Home] [Search]Eric, Looking at your "grandma" histogram, it is pretty clear what is going on. Either the negative itself is vastly overexposed, or you "overexposed" at the scanning stage. I do not know what scanning software you use, but fore example in Vuescan you can easily rectify some of this by adjusting the Gamma parameter until the histogram is not clipped. If the film is overexposed, there is of course only so much you do--it is impossible to get detail where there is none on the film--but you can still do better than the histogram indicates. I do not believe that this has anything to do with PC vs. Mac differences. A clipped histogram is a clipped histogram regardless of the system, especially when it is as severe as is the case with this image. Cheers, Nathan Eric wrote: > Mark: > > >>>http://canid.com/current/palisades_0504_1.html >>> >>>http://canid.com/current/painting_with_grandma_4.html > > >>But you don't see this so often in our modern "print to monitor" photo >>blog world. Histograms kind of point stuff like that out. > > > Thanks for taking the time to look and comment! > > I'm curious how you'd use histograms in these specific examples. > > Here are links to jpegs of histos for each of the above: > > http://canid.com/pics/rock_histo.jpg > > http://canid.com/pics/grandma_histo.jpg > > I can tell by looking at the rock one that I have both shadows and > highlights that are clipped. And clipped highlights in the painting > one. > > To me, the histogram for the rock and tree looks like I have a fairly > even distribution of tones. In the painting one, the white wall in > the background is blown, and you can readily see that in the > histogram. > > I'm wondering if some of contrast is caused by the difference in > PC vs Mac gamma. Any thoughts? > > > -- > Eric > http://canid.com/ > > > > _______________________________________________ > Leica Users Group. > See http://leica-users.org/mailman/listinfo/lug for more information > > -- Nathan Wajsman Almere, The Netherlands General photography: http://www.nathanfoto.com Seville photography: http://www.fotosevilla.com Stock photography: http://www.alamy.com/search-results.asp?qt=wajsman http://myloupe.com/home/found_photographer.php?photographer=507 Prints for sale: http://www.photodeluge.com