[argyllcms] Re: Number of patches - well behaved printer?

  • From: Rishi Sanyal <rishi.j.sanyal@xxxxxxxxx>
  • To: argyllcms@xxxxxxxxxxxxx
  • Date: Fri, 25 Feb 2011 11:13:14 -0800

"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)?

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

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