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[QuadtoneRIP] Linearization with a scanner

[QuadtoneRIP] Linearization with a scanner

2011-02-10 by Sylvain

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)

Re: [QuadtoneRIP] Linearization with a scanner

2011-02-10 by Jim Stewart

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)
>
> 
>


[Non-text portions of this message have been removed]

Re: [QuadtoneRIP] Linearization with a scanner

2011-02-10 by Jim Thyer

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
Show quoted textHide quoted text
  ----- 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]

Re: [QuadtoneRIP] Linearization with a scanner

2011-02-11 by Sylvain

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]
> 
> 
> 
> ------------------------------------
> 
> Yahoo! Groups Links
> 
> Individual Email | Traditional
> 
> 
QuadtoneRIP-fullfeatured@yahoogroups.com
> 
>

Re: [QuadtoneRIP] Linearization with a scanner

2011-02-11 by Jim Thyer

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
Show quoted textHide quoted text
  ----- 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@... 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]
  > 
  > 
  > 
  > ------------------------------------
  > 
  > Yahoo! Groups Links
  > 
  > Individual Email | Traditional
  > 
  > 
  QuadtoneRIP-fullfeatured@yahoogroups.com
  > 
  > 



  

[Non-text portions of this message have been removed]

Re: [QuadtoneRIP] Linearization with a scanner

2011-02-11 by Sylvain

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]
> > 
> > 
> > 
> > ------------------------------------
> > 
> > Yahoo! Groups Links
> > 
> > Individual Email | Traditional
> > 
> > 
> QuadtoneRIP-fullfeatured@yahoogroups.com
> 
> > 
> 
> 
> 
> 
> 
> [Non-text portions of this message have been removed]
> 
> 
> 
> ------------------------------------
> 
> Yahoo! Groups Links
> 
> Individual Email | Traditional
> 
> 
QuadtoneRIP-fullfeatured@yahoogroups.com
> 
>

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