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A-61560 June 2006 53
Contrast — adjusts the difference between black and white, thereby
making an image sharper or softer. The difference between black and
white is small with a low contrast setting so the image is softer. With a
high-contrast setting, the difference between black and white is large,
so the image is clearer. Contrast values range from -50 to 50. The
default is 0.
Threshold — controls the level at which a pixel is considered black or
white (1 bit/pixel). A low threshold value produces a lighter image, and
can be used to subdue backgrounds and subtle, unneeded information.
A high threshold value produces a darker image, and can be used to
help pick up light information. Threshold values range from 0 to 255.
The default is 90.
Filters - Noise
• Lone Pixel: reduces random noise on black and white images by
converting a single black pixel surrounded by white to white or by
converting a single white pixel surrounded by black to black.
• Majority Rule: sets the central pixel value in a matrix according to
the majority of white or black pixels in a matrix.
Threshold: 50 Threshold: 127
No Noise Filter Used Lone Pixel