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 baked into the ARW >> files (Sony's raw format) -- that is the bit values appear to change, >> not just the metadata. > > just for the record: This seems to be a common feature of Sony > cameras. If I understand the settings menu correctly, also the Sony > Alpha 6300 can apply in-camera vignetting correction to raw files. > This feature is turned on, when default factory settings are applied. > The pictures, which have been utilized to generate lens correction > data in liblensfun, have actually been taken with Sony Alpha cameras. > Thus, it would be interesting to know, if liblensfun data is based on > raw raw files or on raw files with in-camera vignetting correction.
The lensfun profiling instructions tell people to switch those corrections off, but it might be necessary to re-profile everything paying heed to the settings; there may have to be two settings for each. I will recheck the images I've used for my profile parts in the lensfun database. OTOH, some people expect "RAW" images to be free of all preprocessing. And, finally, if the camera always bakes a certain correction into the raw images regardless of settings (or because it won't permit you to switch a certain correction "off") then of course the lensfun data will have been produced based on pre-processed RAW. ___________________________________________________________________________ darktable developer mailing list to unsubscribe send a mail to darktable-dev+unsubscr...@lists.darktable.org
