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Binary scanning converts every pixel included in the image to either
black or white. When the image contains a gray area, the threshold
value determines whether the scanner records the area as black or
white. When the threshold value is high, the scanner records more
pixels as black. When the threshold value is low, the scanner
records fewer pixels as black.

Use a binary composition when you want to scan binary images
such as text and line drawings, or black and white images that have
no gray areas.

You can use either the manual threshold or the dynamic threshold
method to set the threshold value in binary scanning.

An entire image is converted to binary using a specific threshold. You can
set a threshold value between 1 and 255. When scanning a light image, set
the threshold higher. When scanning a dark image, set the threshold lower.

Higher threshold

Original image

Lower threshold

Higher threshold