User's Guide

HH1800 User Guide 157

U - Document Image Filter

Allows you to input parameters to sharpen the edges and smooth the area between the edges

of text in an image. This filter should be used with gamma correction (see page 154), with the

scanner in a stand, and the image captured using the command:

IMGSNP1P0L168W90%32D

This filter typically provides better JPEG compression than the standard E - Edge Sharpen

command (see page 150). This filter also works well when shipping pure black and white

images (1 bit per pixel). The optimal setting is 26U.

26U

Document image filter off (default)

Apply document image filter for typical document image

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 E -

Edge Sharpen (page 150) to 22e. Range: 0-255.

Example:

Document Image Filter set to 0U:

Document Image Filter set to 26U:

V - Blur Image

Smooths transitions by averaging the pixels next to the hard edges of defined lines and

shaded areas in an image.

Don’t blur (default)

Blur

Example:

Blur Image Off (0V):

Blur Image On (1V):