Rapiscan AS&E MINI Z, Руководство оператора

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Image Review: Viewing and Enhancing Images
American Science and Engineering, Inc.
MINI Z Operator Manual 342-9000-1 Rev. B ECCN EAR99 8-11
• All points between the Black Point and the White Point are evenly distributed across the 256
shades of gray.
When the Black Point and the White Point are close together there is high contrast with many gray val-
ues for small changes in gray objects.When the Black Point and the White Point are far apart, there is
low contrast with few gray values covering larger changes in gray objects.
When the range between the Black Point and the White Point is shifted to the darker side, there is more
contrast in the darker grays, and the lighter grays are indistinguishable. When the range between the
Black Point and the White Point is shifted to the lighter side, there is more contrast in the lighter grays,
and the darker grays are indistinguishable.
Dynamic Contrast sets the position and range of the Black Point and the White Point. When Dynamic
Contrast is active, the vertical lines at the Black Point and the White Point change from white to gray,
to signify they are not longer manual.
The bar in the histogram is a tool for immediately shifting contrast from the default medium range to a
higher level with a smaller range.
The Histogram button appears in the scan image. Click to open the histogram.
To close the Histogram, tap the “X” (circled at right)
Figure 8-5: Standard Shifts Using the Histogram Bar.
Dynamic
Contrast
(+) Contrast
(+) Brightness