Archived posting to the Leica Users Group, 2015/02/10
[Author Prev] [Author Next] [Thread Prev] [Thread Next] [Author Index] [Topic Index] [Home] [Search]Another clue: I just looked at several of the pictures on the camera's LCD screen. Even blown up to 14x, the tail lights are still red. On Tue, Feb 10, 2015 at 2:33 AM, Douglas Sharp <douglas.sharp at gmx.de> wrote: > Hi Peter, > > looks like blown highlights to me. > > It's possible that the lights that are particularly bright are those of > cars braking (or maybe halogen bulbs that screw up the white balance) > > Cheers > Douglas > > > On 10.02.2015 11:19, Peter Klein wrote: > >> We were treated to quite a show during our anniversary dinner. >> <https://www.flickr.com/photos/24844563 at N04/16304267069/> >> >> I'd like some advice on a technical problem with this picture, and in fact >> with all of the pictures I took of the city from atop the Needle. Red car >> tail lights turn white. It isn't overexposure, because it happens even on >> shots that I deliberately underexposed drastically, where all the RGB >> values are under 255. In shots with any decent city detail, the red >> channel >> does hit 255, but the green and blue are much lower. Lowering the >> exposure >> in post, or using highlight recovery has no effect. >> >> This doesn't happen with larger areas of red light where the pixels have >> the same values as the little tail lights. But taill lights turn white, as >> do other points of colored light like the blue and green Seahawks colors >> that still adorn some construction cranes. The key seems to be that the >> light sources are just a few pixels in diameter. >> >> Maddeningly, on the onscreen preview, the tail lights appear red. But when >> I "develop" the JPG, they turn white.They also turn white if I blow up the >> onscreen preview to 50% size or larger. >> >> The camera is an Olympus E-M5 with 45/1.8 lens, and the RAW developer is >> Capture One v. 7.1.2. Here's a screen clip of the whole picture, followed >> by a section with and a string of car rears blown up to 400% so you can >> see >> what's going on with the pixels. >> < >> http://gallery.leica-users.org/v/pklein/temp/ >> SpaceNeedleMoonriseScrPreview.JPG.html >> < >> http://gallery.leica-users.org/v/pklein/temp/ >> SpaceNeedleMoonriseCars400pct.JPG.html >> Advice, anyone? Is this just an inevitable result of the Bayer array, or >> is >> there a way to fix it? >> >> --Peter >> >> _______________________________________________ >> Leica Users Group. >> See http://leica-users.org/mailman/listinfo/lug for more information >> >> >> > > _______________________________________________ > Leica Users Group. > See http://leica-users.org/mailman/listinfo/lug for more information >