"The photographer who asks us to drum scan colour negatives wants an image that: a. resembles the image they would get if they printed the negative on photographic paper, or b. resembles the original scene." For b.), why can't one simply build a profile from the negative scan (inverted I would think) & spectrophotometric measurements of the reflective target shot (ColorChecker)? Rishi On Fri, Feb 25, 2011 at 10:23 AM, Idea Digital Imaging <qcore@xxxxxxxxxxxxxxxx> wrote: > On 25 Feb 2011, at 18:03, Iliah Borg wrote: > >> Well, than it is just a matter of time and/or money. Short version, take >> some films your customers use most, shoot CC24 Passport using bracketed >> exposures, process the films, scan them, print them, read the prints with a >> spectro, make 2 types of profiles: >> a. transforms from target values to scanned values >> b. transforms from scanned values to print readings. > > > I'd be happy to do that if you, or anybody else says that this process is > working for them on anything other than the roll of negative with the > ColorChecker in it! > > In tests we did a decade ago we exposed multiple rolls of negative with the > same targets and bracketing, sent them to different labs and still couldn't > get them to match! > > In theory it sounds fine -- and maybe in a closed loop within a single lab > it can work too? But is anybody doing this successfully in the real world > (and outside of a closed loop)? > > -- > Martin Orpen > Idea Digital Imaging Ltd > >