QTR-Quadtone RIP

I realize that my first mail was not clear...
I took Paul's curve for Photorag to print a reference (linear) and be able to setup my scanner.
Then, I created MY curve from scratch for the new paper, and my only problem is the last step: linearization.

I hope it's better now :o)

Anayway, I already thank you all for your reactivity...

Sylvain.

 Le ven 11/02/11 12:42, "Jim Thyer" jimth@... a écrit:
> Sylvain
> 
> Your response suggests you started with a linearised curve. 
> 
> I believe that you need to remove the linearization line from Paul's curve,
> then create a new one of your own.  
> If Paul's curve is linearised, then you only replace his linearization with
> yours, you need NO linearization at your starting curve.  Then add your own
> figures.
> JIm Thyer
> 
> ----- Original Message ----- 
> From: Sylvain 
> To: QuadtoneRIP@yahoogroups.com 
> Sent: Friday, February 11, 2011 6:23 PM
> Subject: Re: [QuadtoneRIP] Linearization with a scanner
> 
> 
> 
> 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@n
> etspace.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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> > Individual Email | Traditional
> > 
> > 
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> 
> > 
> 
> 
> 
> 
> 
> [Non-text portions of this message have been removed]
> 
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> 
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