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 it217;s only the last step, I\u2019m 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