Honeywell 4820HDHM User Manual page 182

This filter typically provides better JPEG compression than the standard E -
Edge Sharpen command (see
shipping pure black and white images (1 bit per pixel). The optimal setting is
26U.
0U Document image filter off (default)
26U Apply document image filter for typical document image
n U
Apply document image filter using grayscale threshold n. Use
lower numbers when the image contrast is lower. 1U will have a
similar effect to setting
Range: 0-255.
Example of Document
Image Filter set to 0U:
V - Blur Image
Smooths transitions by averaging the pixels next to the hard edges of defined
lines and shaded areas in an image.
0V Don't blur (default)
1V Blur
Example of Blur Image Off (0V):
8 - 14
page 8-15). This filter also works well when
E - Edge Sharpen
Example of Document
Image Filter set to 26U:
Example of Blur Image On (1V):
(page 8-7) to 22e.