Archived posting to the Leica Users Group, 2008/05/18
[Author Prev] [Author Next] [Thread Prev] [Thread Next] [Author Index] [Topic Index] [Home] [Search]Ken, I find it hard to tell with much precision what is going on, via the M8 camera histogram display anyway. Maybe other cameras are easier to interpret. I also don't know how the jpg settings of the camera affect the camera preview histogram. With Raw capture, my reading suggests that the point where WB is set (during the conversion) doesn't matter if you are only making minor exposure correction (say .25) Beyond that, set it first, automated or sampling then do your exposure adjustment. I'm now trying a Mini ColorChecker chart inclusion in one frame. As used by Bruce Fraser developing the camera profiles. The grey cards that I tried weren't ideal. The WhiBal is supposed to be better than standard grey cards, which aren't really colour neutral, just the right average tone. You can see each channel separately anyway and ACR is good at reconstructing any clipping if not in all three channels (and sets those clipped to white, not grey). I'll have to play with Capture One 4 that I have now too. As for those Benedictine nuns and on-camera flash, don't you dare! Cheers Geoff http://www.pbase.com/hoppyman/e http://gallery.leica-users.org/v/gh/ -----Original Message----- Subject: RE: [Leica] IMG: Yosemite too... and Raw exposure for dynamic range Hi Geoff, Here is the link to a thread on making a custom white balance: http://luminous-landscape.com/forum/index.php?showtopic=22250&st=0 The idea is that the JPG histogram, as displayed, is now closer to the histogram of the raw file, after conversion. I tried it today, and watching the green channel on the camera histogram, it was indeed further to the right (than auto white balance), and the resulting ACR histogram was not as compressed. As a bonus, your camera display is now green, like night vision gear, to impress your friends. As far as the real WB, I always take a gray card shot (with the WhiBal) for that. From the thread, I noted that some raw converters (specifically ACR) are not supposed to be able to handle this well, but the images looked fine to me in ACR. I will try it in Capture One 4.1, but I'm out of play time for today. Evidently this is a technique well known to everyone but me(no surprises there), but I will try it some more. I don't have anything critical coming up until late June, when I am to do a Blurb book for a big gathering of Benedictine nuns here, something they do every 40 years or so. If I screw that up, my next email address will be in Belize! BTW I have to learn on-camera flash by then too! Ken