Canon CXDI-31, Service Manual

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2 Installation Manual
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6) Create the graph below based on the data measured in step 5).
0.00
0.50
1.00
1.50
2.00
2.50
3.00
3.50
1 2 3 4 5 6 7 8 9 10 11
Step
Density
As shown in the above graph, the measurement values need only to nearly form a straight
line
from the minimum density to the maximum density.
The important point here is that the measurement values make a straight line and a
maximum
density corresponding to the settings is output.
If the measurement values deviate too far from the straight line and a maximum density
corresponding to the settings is not output, printer and monitor output linearity settings,
calibration, and other adjustments are necessary.
* The above graph is an example of measurements when the maximum density is
set to 3.2 D and the printed film is measured with a densitometer. Refer to the
data below when the maximum density is set to 3.1 D, or when gradation analysis
software is used to take measurements on the monitor.
* The LINEAR output cannot be set for some printer models.
In this case, try to select an output setting as close as possible to LINEAR.
Ideal density values in LINEAR LINE
Step 1 2 3 4 5 6 7 8 9 10 11
3.2 D 0 0.32 0.64 0.96 1.28 1.60 1.92 2.24 2.56 2.88 3.20
3.1 D 0 0.31 0.62 0.93 1.24 1.55 1.86 2.17 2.48 2.79 3.10
12 Bit 0 410 819 1229 1638 2048 2457 2867 3276 3686 4095
8 Bit 0 26 51 77 102 128 153 179 204 230 255
Possible causes of non-linearity in measurement values:
Inadequate calibration of printer and high-definition monitor
Inadequate settings for CXDI printer parameters
Faults in printer or high-definition monitor
Max setting
density
Film base
density