Learn about calibration curves
What are calibration curves
The media family calibration procedure creates per media print mode two sets of C, M, Y and K
calibration curves: one for the front side and one for the back side.
During the media family calibration the printer uses the patch measurements of the calibration
charts to compensate the differences between the printed color values to the expected color
values.
How calibration curves are calculated
The illustrations below explain how the calibration curves are calculated.
1. When you use an i1 spectrophotometer to
measure a test chart with magenta gradients
from 0% to 100% the measured Lab values will
compose a straight line from paper white (Lab
0,0,0) to the maximum Lab color value at
100%.
0%
Lab value
100%
(0,0,0)
2. A Lab value is not easy for color compari-
sons. It helps to use the (∆E) metric to express
a color value.
The difference between the
Lab value of a col‐
or and the Lab value of paper white (0,0,0)
de-
livers such a ∆E value. This value is called:
Dis‐
tance To White (DTW)
.
The maximum color value (expressed in ∆E)
refers to the 100% tone value. This value is
called: Maximum
Distance To White (Max
DTW)
.
0%
∆E
100%
(0,0,0)
Max
3. When you perform a media family calibra-
tion, all measured values of the patches are
compared to expected values. For every patch
and the in-between tone values a correction
value is calculated. In this example, patch 1
represents the 0% tone value and patch 5 the
100% tone value.
Measurements
ICC
1
Patch
∆E
(0,0,0)
2
3
4
5
4. Per color channel a smooth calibration curve
is composed that represents the correction val-
ues. These calibration curves are used to
slightly adjust the ink amounts the output pro-
file had defined: C=> C', M =>M', Y => Y' and K
=> K'.
In this example, the calibration results in print-
ing less magenta ink in the light areas and
more magenta ink in the darker areas.
0%
M’
M’
0%
Learn about calibration curves
542
Chapter 15 - References
VarioPrint i-series MICR
Содержание VarioPrint MICR i Series
Страница 1: ...VarioPrint i series MICR Operation guide 2015 2019 Canon Production Printing ...
Страница 8: ...Contents 8 VarioPrint i series MICR ...
Страница 9: ...Chapter 1 Introduction ...
Страница 17: ...Chapter 2 Safety and Environment Information ...
Страница 25: ...Chapter 3 Explore the printer ...
Страница 44: ...Integrated camera mounting unit ICMU 44 Chapter 3 Explore the printer VarioPrint i series MICR ...
Страница 45: ...Chapter 4 Getting started ...
Страница 55: ... 37 Password Log in to the printer Chapter 4 Getting started 55 VarioPrint i series MICR ...
Страница 65: ...Chapter 5 Define defaults ...
Страница 96: ...Define the handling of media attributes in JDF ticket 96 Chapter 5 Define defaults VarioPrint i series MICR ...
Страница 97: ...Chapter 6 Job media handling ...
Страница 114: ...Manage the media from control panel 114 Chapter 6 Job media handling VarioPrint i series MICR ...
Страница 115: ...Chapter 7 Transaction printing ...
Страница 154: ...Overrule the set image shift for transaction print jobs 154 Chapter 7 Transaction printing VarioPrint i series MICR ...
Страница 155: ...Chapter 8 Document printing ...
Страница 204: ...5 Touch OK Create a note for the operator 204 Chapter 8 Document printing VarioPrint i series MICR ...
Страница 257: ...Chapter 9 Save energy ...
Страница 269: ...Chapter 10 Manage media definitions ...
Страница 296: ...Adjust the minimum print gap 296 Chapter 10 Manage media definitions VarioPrint i series MICR ...
Страница 297: ...Chapter 11 Manage color definitions ...
Страница 372: ...Create a trapping preset 372 Chapter 11 Manage color definitions VarioPrint i series MICR ...
Страница 373: ...Chapter 12 Print what you expect ...
Страница 425: ...Chapter 13 Maintain the printer ...
Страница 489: ...Chapter 14 Problem Solving ...
Страница 518: ...Adjust media registration parameters 518 Chapter 14 Problem Solving VarioPrint i series MICR ...
Страница 519: ...Chapter 15 References ...
Страница 553: ...Chapter 16 Regulation Notices ...
Страница 562: ...562 Chapter 16 Regulation Notices VarioPrint i series MICR ...
Страница 575: ......