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Parameter range:
i= 00
H
(0): Enable halftoning mode A (hard tone): B1 B2 B3 B4 B5 A5
i= 10
H
(16): Enable halftoning mode B (soft tone): B2 B3 B4 B5 A5
i= 20
H
(32): Enable halftoning mode C (net-screen): B2 B3 B4 B5
i= 80
H
(128): Dither mode A (4 x 4 Bayer): B4 B5 A5
i= 90
H
(144): Dither mode B (4 x 4 spiral): B4 B5 A5
i= A0
H
(160): Dither mode C (4 x 4 net screen): B4 B5 A5
i= B0
H
(176): Dither mode D (8 x 4 net screen): B4 B5 A5
i= C0
H
(192): User-defined dither pattern A: B4 B5 A5
i= D0
H
(208): User-defined dither pattern B: B4 B5 A5
i= 01
H
(1): Disable the halftoning process, Disable Text Enhancement
Technology: B1 B2 B3 B4 B5 A5
i= 03
H
(3): Disable the halftoning process, Enable Text Enhancement
Technology: B5 A5
Default value: i = 00
H
Explanation:
This command enables or disables the halftoning process modes for
bi-level (1 bit per pixel per color) and quad-level
(2 bits per pixel per color) data.
This command also enables or disables Text Enhancement
Technology, which optimizes the threshold value and eliminates
background noises.
During halftoning mode, the level (on or off) and color of newly read
pixels is determined in conjunction with the calculated level and color
of surrounding dots that have already been read. This method is
designed to interpolate for possible errors during the process of
digitizing the image data. In contrast, the dither modes use fixed
patterns in a matrix to simulate tonal values.
When the halftoning mode is disabled, the image data becomes plain
bi-level or plain quad-level data, according to the data format.
The halftoning process simulates tone differences in an image with
bi-level or quad-level data. It is suited for scanning originals with
continuous tones, such as photographs. This process is not suited for
images without varying tones, such as line art.
3-46 Command Reference