Canon CXDI-1, Operation Manual

Page: 87 / 170

Continued on the following page >>
7. Processing the Image (QA Mode Screen)
– 79 –
4
Set the low density effect.
Touch or to select a setting from
+10 to -10
.
Although large values will improve the visibility of low density regions of the image, the
use of too large a value may result in an increase of the graininess of the image.
The value on the left is the value analyzed automatically (DEP analysis value). The value
on the right is the efficacy that will be added to the analyzed value on the left side (table
below).
The larger the number, the stronger the processing.
Suppose the analyzed value is 0.50. If the setting is +1, the DEP will be 0.45. If the
setting is -1, it will be 0.55.
If the analyzed value is 1.00, it is the same as if the DEP had not been performed.
The effect is limited to the 0 to 1 range.
5
Set the starting level of low density.
Touch or to select a setting from
+10 to -10
.
The value on the left is the value analyzed automatically (DEP analysis value). The value
on the right is the efficacy that will be added to the analyzed value on the left side (table
below).
A larger starting level results in a wider effect range, and a smaller starting level results
in a narrower range.
Suppose the starting level is 1500. If the setting is +1, the starting level will be 1600. If
the setting is -1, the level will be 1400.
Table 7.6.1C: Setting Values – Corresponding Efficacy (low density)
Setting -10 -9 -8 -7 -6 -5 -4 -3 -2 -1 0
Efficacy 0.50 0.45 0.40 0.35 0.30 0.25 0.20 0.15 0.10 0.05 0.00
Setting +1 +2 +3 +4 +5 +6 +7 +8 +9 +10
Efficacy -0.05 -0.10 -0.15 -0.20 -0.25 -0.30 -0.35 -0.40 -0.45 -0.50
Efficacy of low density
When the efficacy of low density is
increased, the range of pixels will narrow
after the image is processed at a lower level
than the compression starting level.
Table 7.6.1D: Setting Values – Starting Level Changes (low density)
Setting -10 -9 -8 -7 -6 -5 -4 -3 -2 -1 0
Starting
Level
Change
-1000
-900 -800 -700 -600 -500 -400 -300 -200 -100 0
Setting +1 +2 +3 +4 +5 +6 +7 +8 +9 +10
Starting
Level
Change
100 200 300 400 500 600 700 800 900 1000
Pixel value
before the process
Pixel value
after the process
Compression starting level
0.45 (S1)
0.50 (Setting 0)
0.55 (Setting -1)