QTR-Quadtone RIP

I have ink limit at 90%, boost at 95%, shadow at 12 & overlap at 16. The 
paper is Permajet Alpha. The limit is quite high so I'm not sure how 
much effect black boost is having anyway. I chose the high limit as the 
dmax was at its greatest (1.72 absolute) on the 90% patch.

I'm using x-rite 810 for measurements and I've re-checked them and they 
are consistent.

I'll have a play around with reducing the boost & the overlap as I don't 
seem to get quite the dmax I did on the calibration strip.

Howard





John Moody wrote:
> The last step has a much higher density increase than all others, 
> effectively asking the linearization to fix a sharp bend at the end of 
> the curve. 
> 
> Do you have black boost at a fairly high level?  If so, you may get 
> smoother results cutting back on black-boost, and upping the ink limit 
> to achieve the 1.69 Dmax you are getting.  A high shadow value can bend 
> the curve like that as well, but since it\ufffds only the last step, I\ufffdm 
> guessing black boost. 
> 
> Also, if you scanned the patches with an i1, you might go back and 
> re-read the last several in patch mode to see that you get consistent 
> values.  I have a hypothesis that the dark patch accuracy degrades with 
> increasing scan speed, but I have not seen others corroborate that.
> 
>  
> 
> Best regards,
> 
> John Moody
> 
>  
> 
> -----Original Message-----
> *From:* QuadtoneRIP@yahoogroups.com 
> [mailto:QuadtoneRIP@yahoogroups.com]*On Behalf Of *Howard Shaw
> *Sent:* Thursday, October 27, 2005 5:51 PM
> *To:* QuadtoneRIP@yahoogroups.com
> *Subject:* [QuadtoneRIP] Error message: Invalid linearize curve - not 
> constantly increasing
> 
>  
> 
> I was making a linearisation today with the following values from a
> 51-step and got the above error message and the curve was not created:
> 0.06
> 0.08
> 0.1
> 0.12
> 0.15
> 0.17
> 0.2
> 0.23
> 0.26
> 0.29
> 0.33
> 0.36
> 0.41
> 0.45
> 0.48
> 0.53
> 0.57
> 0.61
> 0.65
> 0.69
> 0.72
> 0.75
> 0.79
> 0.83
> 0.87
> 0.91
> 0.95
> 0.98
> 1.01
> 1.04
> 1.09
> 1.12
> 1.14
> 1.18
> 1.19
> 1.22
> 1.24
> 1.28
> 1.31
> 1.34
> 1.37
> 1.4
> 1.42
> 1.46
> 1.49
> 1.52
> 1.55
> 1.57
> 1.6
> 1.62
> 1.69
> 
> All the values are increasing albeit not "constantly". If I change the
> penultimate value from 1.62 to 1.63 the curve creation works. Any reason
> this should be so?
> 
> Howard
> 
> 
> 
> 
> 
> 
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