QTR-Quadtone RIP

If you don't hear any better advise, try skipping step 7. Seems like step 7
is doing something meant for the linearization procedure, resulting in
overcorrection.
J Stewart.

On Thu, Feb 10, 2011 at 3:33 PM, Sylvain <sylvain@grainsdefolie.net> wrote:

>
>
> 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)
>
> 
>


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