On Fri, Aug 14, 2020, at 09:53, Miklós Müller wrote: > 2. set white balance using a spot on the film base (unexposed stripe > between slides)
In theory, at least, the white balance should be set for the actual light source alone, rather than the light source through the unexposed film, while all handling of the film mask is later done by negadoctor, *after* the camera capture has been through the camera matrix in "input color profile". The idea is that you are first correcting for the light and camera color to get a true "neutral" scan of the negative itself for further inverting and processing by negadoctor. > 3. use the global color picker to note the values for the white (well > grey) stripe between two slides, convert them to hex rgb The last time I checked, the picker in negadoctor was sensitive to dust, scratches, etc and required a really clean sample area for good results; I'm not sure if this has been improved by now or not (I would guess not). Anyway I think the global picker would be seeing different data from a different point in the pipe than negadoctor, so using that isn't quite in line with "negadoctor theory"... but ultimately what matters is that you get results that you like, of course. :-) -- jys ____________________________________________________________________________ darktable user mailing list to unsubscribe send a mail to [email protected]
