QTR-Quadtone RIP

Yes, it was the linearized curve. I wanted to get a linear printed strip (as a reference).

Sylvain.

 Le jeu 10/02/11 23:38, "Jim Thyer" jimth@netspace.net.au a écrit:
> Sylvain,
> 
> Simple question,
> 
> In step 1 you used Paul's curve, did it still contain his linearisation
> figures?
> Otherwise you have introduced a new linearization, not corrected it.
> 
> Jim Thyer
> 
> ----- Original Message ----- 
> From: Sylvain 
> To: QuadtoneRIP@yahoogroups.com 
> Sent: Friday, February 11, 2011 7:33 AM
> Subject: [QuadtoneRIP] Linearization with a scanner
> 
> 
> 
> Hi all,
> 
> I've been printing with paul's curves on Photorag for a whil now, and I'm
> trying new papers. Since I do not have any spectro, I tried to linearize my
> profile with my Epson V500 scanner.
I did it this way:
> 1. Printed a 21 step strip on Photorag with Paul's curve, let it dry.
> 2. Scanned it (tif, gray levels)
> 3. adjusted the picture (with Gimp) to get the white square at 100% and the
> black one at 0%
4. adjusted the gamma (1.3), to have all squares (or nearly) at their
> normal value (100-95-90-85-...)
5. Printed same strip on new paper with non linearized curve, let it
> dry.
6. scanned it with same parameters as 2.
> 7. adjusted it: black, white, and gamma to 1.3
> I got the following values:
> 100-96-90-84-79-72-65-62-60-53-47-45-40-34-27-23-21-19-15-9-0
8. I put the values in QTR for linearization.
> 9. Printed a new strip to check. Bad result. Seems to be too much
> corrected.
> Question: what did I miss?
> 
> Help!
> 
> Thx :o)
> 
> 
> 
> 
> 
> [Non-text portions of this message have been removed]
> 
> 
> 
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