On Tue, Jul 2, 2013 at 10:04 PM, johannes hanika <[email protected]> wrote: > > On Wed, Jul 3, 2013 at 7:41 AM, Emmanuel Lacour <[email protected]> wrote: >> >> On 02/07/2013 20:10, Pascal de Bruijn wrote: >>> >>> >>> I just downloaded three random 5DmkII samples from photographyblog, >>> and imported them into darktable-1.1.x which has the same temperature >>> code as git master. >>> >>> I got the following three Kelvin values for shots that seem to have >>> been shot in plain daylight: >>> >>> 6173K >>> 5768K >>> 4638K >>> >> >> >> on this one: >> http://img.photographyblog.com/reviews/canon_eos_5d_mark_ii/sample_images/canon_eos_5d_mark_ii_08.cr2 >> >> I have 3223°K and a visual near the jpg one (a little bit warmer) >> > comparisons to the jpg are really very useless, there is such a lot of > differences between the two processing pipeline that it's not enough at all > to look at white balance. actually the wb coeffs might be the only thing > that we read out of the raw in a meaningful way and apply similarly to the > jpg processing in your camera. > > about the kelvin numbers: these are dreamed up by taking what the camera or > our presets claim to be daylight balance, identifying it as about 5000 or > 5500K and inferring a value for your current rgb coefficients from that (as > pascal said, very unscientific that part). it does seem a little odd that > the daylight preset ends up at 3400K, that's true. as mentioned somewhere in > this thread, this is a mere UI thing though, the number doesn't matter at > all for image processing, that's done using the rgb coefficients. > > reverting pascal's commit will result in 5507K for daylight balance instead, > so i guess you have a valid point there.
Not at all... The "Daylight" wb-preset lists 4923K over here (darktable-1.1.x tree, but it should have the same code as master for temperature). around 5000K is fine. Regards, Pascal de Bruijn ------------------------------------------------------------------------------ This SF.net email is sponsored by Windows: Build for Windows Store. http://p.sf.net/sfu/windows-dev2dev _______________________________________________ Darktable-users mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/darktable-users
