service Manual
Product Description
1.8 SCANNER FUNCTIONS
Table 1-8 summarizes the scanner’s functions and settings. These functions, which are explained
on the following pages, are all controlled by software commands.
Table 1-8. Scanner Functions
Function
Command
Available Settings
1
Data format
D
1 to 8 bits per pixel for each color.
Output resolution
I
R
29 settings, from 50 to 1200 dpi (main scan and sub scan
resolutions can be set
Zoom
H
to 200°/0,
by
step (main scan and sub scan zoom
percentage can be set independently).
Reading area
Offset and reading length.
Color mode
C
Color line sequence, color page sequence, monochrome
mode, selectable drop-out color.
Digital
B
1 disable for the digital
mode, 3
modes, 4 dither
2 user download dither
Color correction
M
4 settings for the output device (available only for color line
sequence mode).
Brightness
L
7 levels.
Sharpness
Q
5 levels.
Gamma correction
Z
6 settings for the output device.
Scanning mode
I
Normal, high speed.
1.8.1 Data Format
The data format specifies the number of bits (from 1 to 8) used to represent the tone of each pixel.
Larger values enable a greater variety of tones or colors.
In monochrome mode, a format setting of 1 bit/pixel
data) provides only two tones: black
(0) and white (l). A setting of 2 bits/pixel (quad-level data) shows four tone levels (corresponding
to binary values 00, 01, 10, and 11). Eight bits/pixel provides for 256 shades of gray, generating a
result that has photographic quality.
When used with color mode, the data format defines the number of tones for each primary color
(green, red, and blue). A setting of 1 bit/pixel allows for eight colors (2x2x 2); 2 bits/pixel can
represent
64
colors
(4 x 4 x 4).
Eight bits/pixel (providing a total of 24 bits for each pixel) can
represent more than 16 million different colors.
Table 1-9. Data Format
Data
Format
Monochrome
Color
1 bit/pixel
2 grays
8
colors
2 bits/pixel
4 grays
64 colors
3 bits/pixel
8 grays
512 colors
4 bits/pixel
16 grays
4,096 colors
5 bits/pixel
32 grays
32,768 colors
6 bits/pixel
64 grays
262,144 colors
7 bits/pixel
128 grays
2,097152 colors
8 bits/pixel
256 grays
16,772,216 colors
If you want to reproduce images using more than
2
bits/pixel, use an output device capable of
supporting the resulting tonalities. Most microcomputer displays and printers cannot support
such tonalities. To achieve optimal results with these devices, normally use a 1 bit/pixel format
together with
mode. The
D command sets the data format.
Rev.
1-17
Summary of Contents for ES-1200C Pro PC
Page 2: ...EPSON IMAGE SCANNER GT 9000 ES 1200C SERVICE MANUAL EPSON ...
Page 6: ...REVISION SHEET Revision Issue Date Revision Page Rev A June 29 1994 let issue o j c1 v ...
Page 66: ...Chapter 4 Adjustments No Adjustment is required in this product ...
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