Yahoo Groups archive

Digital BW, The Print

Index last updated: 2026-04-28 22:56 UTC

Message

Re: [Digital BW] Re: Invalid linearize curve -- not constantly increasing

2012-06-01 by Terry Ritz

On 12-06-01 1:33 AM, "Ernst Dinkla" <e.dinkla@...> wrote:

> There is another way to get the Lab b on a zigzag course. Measure a
> target with heavy bronzing and the 45/0 degree reflection optics in a
> spectrometer are affected by the bronzing layers. The measured color is
> not 1:1 to what the eye sees in color of the bronzing but that is
> understandable given the spectrocam's light source and sensor as another
> light + another observer. In practice one would not select a B&W
> paper/ink combination that creates that much bronzing but in color
> printing it may be less obvious and play a role when colors are off
> after profiling. Grey range in color prints for example. I will put some
> QTR linearisation plots on my site to show the difference between a
> target with and without bronzing.

Not that's very interesting, and something well worth keeping in mind.

Would L* values suffer in this circumstance?

Terry.

Attachments

Move to quarantaine

This moves the raw source file on disk only. The archive index is not changed automatically, so you still need to run a manual refresh afterward.