Re: [darktable-dev] Lens correction based on EXIF data on Sony cameras

2017-04-08 Thread Kelvie Wong
On Sat, 8 Apr 2017 at 11:50 Kelvie Wong wrote: > I'm still investigating if TCA correcions are baked in even if they are > turned off in-camera; a preliminary test shows a difference of only about > +/- 0.0001, not sure that's significant or not (see attached diff; > generated using tca_correct w

Re: [darktable-dev] Lens correction based on EXIF data on Sony cameras

2017-04-08 Thread Kelvie Wong
Thanks, Matthias. On Sat, 8 Apr 2017 at 05:03 Matthias Andree wrote: 1. If the assessments of your references are true that TCA (LateralChromaticAberration) are always baked into the ARW then the lensfun data will have been measured with TCA pre-corrected by the camera and lensfun data will on

Re: [darktable-dev] Lens correction based on EXIF data on Sony cameras

2017-04-08 Thread Matthias Andree
Greetings, I have created a related ticket with the lensfun project: https://sourceforge.net/p/lensfun/bugs/78/ This really only matters for VignettingCorrection: 1. If the assessments of your references are true that TCA (LateralChromaticAberration) are always baked into the ARW then the lens

Re: [darktable-dev] Lens correction based on EXIF data on Sony cameras

2017-04-07 Thread Kelvie Wong
On the plus side, distortion is not, and CA is relatively easy to correct. Vignetting is hard to manually correct with the current darktable modules, however, without doing some type of stacking of vignette modules or exposure with circular masks. I have a theory that with the corrections on, the

Re: [darktable-dev] Lens correction based on EXIF data on Sony cameras

2017-04-07 Thread Matthias Andree
Am 07.04.2017 um 09:38 schrieb Heiko Bauke: > Hi, > > Am 05.04.2017 um 07:33 schrieb Kelvie Wong: >> I just realized that on my Sony a7R II (and this probably applies to all >> of the cameras in this series, probably even the NEX), if you have >> certain camera settings, some lens corrections are b

Re: [darktable-dev] Lens correction based on EXIF data on Sony cameras

2017-04-07 Thread Heiko Bauke
Hi, Am 05.04.2017 um 07:33 schrieb Kelvie Wong: I just realized that on my Sony a7R II (and this probably applies to all of the cameras in this series, probably even the NEX), if you have certain camera settings, some lens corrections are baked into the ARW files (Sony's raw format) -- that is t

[darktable-dev] Lens correction based on EXIF data on Sony cameras

2017-04-04 Thread Kelvie Wong
Hello all, I just realized that on my Sony a7R II (and this probably applies to all of the cameras in this series, probably even the NEX), if you have certain camera settings, some lens corrections are baked into the ARW files (Sony's raw format) -- that is the bit values appear to change, not jus