Archived posting to the Leica Users Group, 2015/02/10
[Author Prev] [Author Next] [Thread Prev] [Thread Next] [Author Index] [Topic Index] [Home] [Search]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 > >