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

  • From: Idea Digital Imaging <qcore@xxxxxxxxxxxxxxxx>
  • To: argyllcms@xxxxxxxxxxxxx
  • Date: Mon, 28 Feb 2011 10:08:16 +0000

On 26 Feb 2011, at 15:48, Iliah Borg wrote:

On Feb 26, 2011, at 10:48 AM, Qcore wrote:

My thoughts are that profiling in negative scanning workflows is doing little more than providing a rough guide for the interpretative edits which are always required.

A scanner cannot get RGB values from negative that have any dependable relationship with the colorimetry of the original scene. That's the whole point of using negative -- massive exposure range recorded using minimal density range.

And given that the scanned values don't correspond to the colorimetry of the final print either, I can't see profiling playing anything other than a very minor part in the image processing.

Was the above from your previous e-mail?

No, it was from thinking about your previous email and also Rishi's comment:

For [matching the original scene], why can't one simply build a profile from the negative scan
(inverted I would think) & spectrophotometric measurements of the
reflective target shot (ColorChecker)?

Unfortunately the thinking was done at the gym and the reply attempted on an iPod :(


Martin Orpen
Idea Digital Imaging Ltd

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