looks a nice setup. I suspect putting in a bright 6500K LED bulb would help and as suggested additional blue filtration might be good as well. Advantage of LED is cool temperature so less problems with heat bending negatives in the holder.
On Thu, 13 Aug 2020 at 15:07, jys <[email protected]> wrote: > > > On Wed, Aug 12, 2020, at 08:24, Miklós Müller wrote: > > As for the scanning resolution, I have to resort to my 6MP Nikon D50, my > budget does not allow for more ATM. > > > > Here's the scanning rig BTW: https://photos.app.goo.gl/8dUqTJkvmsdm9BTY8 > > That is a beautiful reproduction rig, but... if it's as old as it looks, I > guess it uses some kind of incandescent light source? If you want to make > the most of your camera's dynamic range, you probably want to use a very > "cool" light source (6500K, aka "daylight", or even add some gels to make > it even more "blue"). This way, you won't end up with such an underexposed > blue channel in order to avoid clipping the red channel; it will move them > all a little closer together in the histogram. This crudely approximates > what film scanners do by exposing the different channels for different > lengths of time. It just helps with not having to push the digital > stretching of the blue channel quite as hard. Take a shot without film > loaded to get a white balance for the light itself, and use that WB setting > for all the shots, then use the negadoctor module to further adjust for the > remaining orange mask. > > In addition to the links already provided for information about negadoctor > module, also pay attention to the tooltips when hovering over the slider > labels - there's a lot of information there. > > And, just for my take on processing one of the old negatives, attached is > an XMP for the first one, which also uses the color balance module to > further correct some of the extreme color cast into something a little more > neutral. Note the use of the parametric blend to constrain the processing > to the shadow areas. You could do even better with more time spent on the > masking, but it's a quick example. :-) > > -- > jys > > ____________________________________________________________________________ > darktable user mailing list > to unsubscribe send a mail to > [email protected] > > -- Dr Terry Pinfold Cytometry & Histology Lab Manager Lecturer in Flow Cytometry University of Tasmania 17 Liverpool St, Hobart, 7000 Ph 6226 4846 or 0408 699053 ____________________________________________________________________________ darktable user mailing list to unsubscribe send a mail to [email protected]
