A-61560 January 2007
57
Threshold
— aids in controlling the level at which a pixel is considered
black or white. Decreasing this setting will make the image appear
lighter, and can be used to subdue background noise. Increasing this
setting will make the image appear darker, and can be used to help pick
up light information. The options range from 0 to 255. The default is 90.
NOTE: This is not available for
Conversion quality: Best
.
Filters
• Noise
- (
none
)
-
Lone Pixel:
reduces random noise by converting a single black
pixel to white when it is completely surrounded by white pixels or
by converting a single white pixel to black when it is completely
surrounded by black pixels.
-
Majority Rule
: sets each pixel based on its surrounding pixels.
The pixel will become white if the majority of the surrounding
pixels are white and visa versa.
• Image
- (
none
)
-
Halftone Removal
: enhances dot matrix text and images with
halftone screens (e.g., newspaper photographs).
Invert Colors
— allows you to select how the black pixels will be stored
in the image. By default the black pixels are stored as black and the
white pixels are stored as white. Turn this option on if you want the
black pixels stored as white and the white pixels stored as black.
NOTE: You may want to change this option if your application
misinterprets the image data and stores your image in reverse
of what you expect.
Threshold: 50
Threshold: 127
