Service manual

4.5.3 Auto Letter/Photo Separation

In auto letter/photo mode, the original image is separated into letter and

photo areas (dot screen areas).

NOTE:

"Letter" refers to an original or area of an original that contains text

and/or line drawings.

Generally, letter areas have strong contrast between the image and the

background. However, photo areas (dot screen areas) have a less extreme

range of contrast levels.

By using these characteristics and the following separation methods, the

original image is separated into black letter areas, colored letter areas, and

photo areas in the final evaluation circuit.

IMAGE PROCESSING

A166/A187/A189 2-48 SM

CÓPIA NÃO CONTROLADA