A75UM3EA (Ver. E.2)
3-59
2. If the selected Threshold Level is proper, it is possible to gain a proper copy since such images
as “Foggy background”, “Dirt” and “Black dots” are judged “unnecessary light images” and are
converted to “white images” as the following example 3.
(Example 3 : Threshold Level is proper.)
(Original) (Result of copy)
[Example of usage]
Supposing you will copy the following graph (section) paper original.
It has 2 kinds of image such as line graph image (clear black) and section image (light blue).
1) The section image will be lost when you copy this original with a small Threshold Level since it
is judged “unnecessary light image”.
(Original) (Copy : Section image is lost.)
2) If you select a larger Threshold Level, it is possible to copy the section image in a clear gray
since it is judged “necessary dark image”.
With this setting, however, the background image may be also judged “necessary dark image”
and becomes evident.
(Original) (Copy : Background becomes evident.)
3) If you select not only larger Threshold Level but also Background Mode, section image is
judged “necessary dark image” but the background is judged “unnecessary light image”.
As the result, it is possible to emphasize only the section image .
(Original) (Copy : Background is deleted.)
ABCDE
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