I believe white balance is nothing to worry about. Anyway you adjust channels individually in negadoctor module without any reference to the bulb type. The only thing you should worry about is to get no clipping in individual channels of your "scan".
Timur. On Thu, 2020-08-13 at 08:27 +0200, Miklós Müller wrote: > Jys, > > Thanks for the tips, they absolutely me sense. I used a 2700k led > until now, but will definitely give a try to a cooler e17 bulb. > > M > > > On 2020. Aug 13., at AM 7:08, jys <junkyardspar...@yepmail.net> > > 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 > > darktable-user+unsubscr...@lists.darktable.org > > > > <20200807-114609.nef.xmp> > _____________________________________________________________________ > _______ > darktable user mailing list > to unsubscribe send a mail to > darktable-user+unsubscr...@lists.darktable.org > ____________________________________________________________________________ darktable user mailing list to unsubscribe send a mail to darktable-user+unsubscr...@lists.darktable.org
