On Thu, 31 Jan 2019 at 07:59, Archie Macintosh <[email protected]> wrote: > > On Wed, 30 Jan 2019 at 23:30, David Vincent-Jones <[email protected]> wrote: >> >> Can somebody explain why (on some occasions only) the 'black relative >> exposure' slider, sets itself to a maximum value when using the 'auto >> tune levels'. The value appears to be totally incorrect and manual >> correction needs to be made. >> >> David > > > Are you using Fuji RAF files? Aurélian Pierre says in his blog post about > Filmic that what you describe can happen with RAF files because of an issue > with demosaicing them. He advises manual adjustment. > > mac >
This is what Aurélian says about this 'known issue': "In noisy pictures, or in pictures that suffer from poor demosaicing (RAW from X-trans sensors), the black level will often be detected at -16 EV (minimum of the range). You need to correct that manually to obtain realistic values." See: https://eng.aurelienpierre.com/2018/11/30/filmic-darktable-and-the-quest-of-the-hdr-tone-mapping/#known_issues ____________________________________________________________________________ darktable user mailing list to unsubscribe send a mail to [email protected]
