HH490 User Guide 155
K - Gamma Correction
Gamma measures the brightness of midtone values produced by the image. You
can brighten or darken an image using gamma correction. A higher gamma
correction yields an overall brighter image. The lower the setting, the darker the
image. The optimal setting for text images is 50K.
0K
50K
n
K
Gamma correction off
(default)
Apply gamma correction for brightening typical document image
Apply gamma correction factor
n
(
n
= 0-1,000)
Example:
Gamma Correction set to 0K: Gamma Correction set to
50K:
Gamma Correction set to
255K:
L, R, T, B, M - Image Cropping
Ships a window of the image by specifying the left, right, top, and bottom pixel
coordinates. Device columns are numbered 0 through 1279, and device rows are
numbered 0 through 959.
n
L The left edge of the shipped image corresponds to column
n
of the
image in memory. Range: 000 - 843.
(Default = 0)
n
R
The right edge of the shipped image corresponds to column
n
- 1 of
the image in memory. Range: 000 - 843.
(Default = all columns)
n
T The top edge of the shipped image corresponds to row
n
of the image
in memory. Range: 000 - 639.
(Default = 0)
n
B
The bottom edge of the shipped image corresponds to row
n
- 1 of
the image in memory. Range: 000 - 639.
(Default = all rows)
Uncropped Image: Image Crop set to 300R:
Image Crop set to 300L:
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