Archived posting to the Leica Users Group, 2007/02/18
[Author Prev] [Author Next] [Thread Prev] [Thread Next] [Author Index] [Topic Index] [Home] [Search]Hi Bob, Of course your questions are very valid. The photos are what they are. I have seen a shift in the same type of scene (indoor lighting) without changing the ISO. I feel the Auto WB may be getting fooled at times by the high IR content in the light. I have IR cut filters for most of my lenses now (not furnished by leica) and I don't see the shift. Maybe I need to take more photos. Today would be a good day with and without filters. I'll report what I find. I'll also go up and down the ISO range. Magenta cast: I don't see that in your photos. The black bags look black. I don't know what kind of material is most susceptible. I do have a LowePro S&F Reporter 500 black bag to experiment on. The material might be different though. Len On Feb 18, 2007, at 11:37 AM, Robert D. Baron wrote: > Don Dory wrote: > >> Don't sweat the wb Bob. Shoot in DNG and all will be very well >> indeed. Minor tweaking in the converter of your choice, not much >> different than color film but faster and easier. Forget the jpg's, >> raw is good. > > Don, I should have been more clear. The shots I posted had to be > converted to .jpg to be uploaded but the original shots were > .dng; I have only shot raw files for the last several years. I > merely opened these .dng image files in the beta of Adobe Lightroom > and I immediately noticed the odd (to me) color shift as the ISO > had been adjusted upward when they were made; I did no sharpening > or color management whatsoever. > > To reiterate my original question: > >> One question I have is about the color it produced on my test; I may >> be having brain fade and not remembering something I should know, but >> please take a look at these 4 test shots from ISO 160 to 2500 (you >> can see the ISO of each when you click through from the thumbnails to >> the full size images) and tell me why there is such a color shift as >> the ISO increases: http://www.bobbaron.com/M8TestFeb07/index.htm > > I'm trying to be an observer, not a complainer. I'm just curious > as to 'why'. > > And while we are talking I've got one more question for those of > you with better color vision than me (probably most all of you; > I've got typical male red-green anomalous vision to some small but > apparent degree): I made it a point to include the rack with black > LowePro gadget bags in the right 1/3 of these shots....I assume > they contain some synthetic material and was wondering if they > would display the infamous magenta color cast. Do they? > > Again, I like the camera overall and I'm sure I'll add one to my > bag at some point. These are just questions I'm asking. > > The LUG is one of the few places I can get answers......all kinds > of answers.... ;-) ;-) > > Thanks and best regards, > > --Bob > > > > > _______________________________________________ > Leica Users Group. > See http://leica-users.org/mailman/listinfo/lug for more information