Kodak i55 - Manual (Page 63)

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Dithering  a method used to simulate gray levels. When selected,
the Dithering options are available.
• 64-Level Bayer Dither, 64-Level 45 Degree Clustered Dot Screen
and 64-Level Dispersed Dot Screen: these represent alternative
screening options to emulate gray.
Contrast %  sets the image contrast by adjusting the difference
between black-and-white, thereby making an image sharper or softer.
Contrast is only available for binary images.
In a low contrast setting, the difference between black-and-white is
small, so the image is softer. In a high contrast setting, the difference
between black-and-white is large, so the image is clearer. Select a
contrast value from 1 to 100. The default is 50.
Manual  is always selected for binary images. Adjust the Contrast
setting by dragging the Contrast sliding bar to the left or right to achieve
the desired Contrast setting. Scan the document to check the contrast.
Threshold  thresholding is used to convert a grayscale image into a
binary (1 bit/pixel) image. The thresholding value ranges from 0 to 255.
The default is 90. A low threshold value will produce a lighter image,
and can be used to subdue backgrounds and subtle, unneeded
information. A high threshold value will produce a darker image, and
can be used to help pick up faint images.
Contrast 1
Contrast 60
Contrast 100