Archived posting to the Leica Users Group, 2015/02/10
[Author Prev] [Author Next] [Thread Prev] [Thread Next] [Author Index] [Topic Index] [Home] [Search]Colour gamut in jpg against RAW, colour space conversion? Did you try outputting in .tif format? Douglas On 10.02.2015 11:38, Peter Klein wrote: > 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 >> > _______________________________________________ > Leica Users Group. > See http://leica-users.org/mailman/listinfo/lug for more information > >