Archived posting to the Leica Users Group, 2012/09/02
[Author Prev] [Author Next] [Thread Prev] [Thread Next] [Author Index] [Topic Index] [Home] [Search]On the M9 histogram, I would humbly add that while I may be able to recover where just one channel is clipped this amateur treats that as a get out of jail rather than routine option. Clip two and the situation is potentially worse of course. Then you get into how many values your output device (monitor/printer) can actually display anyway. The histograms seen in Raw processors are different and generated in a different way, plus are program setting dependant anyway (as I'm sure that you know). All of which makes my brain bleed a little, so I guess continuing to take the camera histogram as a guide and just avoiding that hard clipping where relevant is better to cope with as a practical matter. If you have preview display on by default, once the low resolution preview is generated for the LCD (and you can see the display change WB for example as that happens) you can also see the histogram for just part of the frame when you zoom the preview. But then none of that demosaicing is going on with the Monochrom. Each photosite generates one grey value with no interpolating an R,G or B value from an adjacent photosite of same 'colour'. Erwin Puts has some interesting comment on a possible effective resolution change due to that too. Then there is no 14 BIT/8 BIT voodoo going on either, so it really is a different kettle of fish. Someone send me one and I promise to test it out and report back ;-) Cheers, Geoff http://www.pbase.com/hoppyman On 3 September 2012 15:20, Paul Roark <roark.paul at gmail.com> wrote: > Marty Deveney <benedenia at gmail.com> wrote: > > I've found Leica's histograms harder to come to terms with ... > > As a practical matter, they seem to work. I wait a few seconds for > the test shot to be processes, and then hit the "Play" button and then > the "Info" button. You can then adjust the exposure as needed to get > the histogram to the right edge, but not clipping. > > As I understand it, the M9 histogram is actually the Jpeg histogram. > As such, you have some extra you can pull out of raw file with > "recovery," which taps into the fact that one of the R, G or B > channels may not have been blown out. The MM, however, does not have > that extra margin of safety. So, with it, you have to be very careful > that the histogram is is not clipping (hitting the right side of the > graph. The issue with the MM may be that you'd want a 1/16 or an inch > or so gap between the apparent histogram end and the right side to be > sure there are not small area of brightness than just don't show up > enough on the graph. > > But, again, the bottom line for me is that with the use of the > histogram, I never have a problem. It simply works. > > Paul > www.PaulRoark.com > > _______________________________________________ > Leica Users Group. > See http://leica-users.org/mailman/listinfo/lug for more information >