Operation Manual

1.5.3 Image gradation and bit data size
Refer to the description below for the relationships between the image gradation and
the bit data size.
a) 256-gradation/8-bit data/multi-value
256-gradation is processed by 8-bit data. Within the scanner, the image processing
unit in the scanner controller normally processes the 8 bit data. 256-gradation can
also be referred to as the multi-value.
b) 2-gradation/1-bit data/2-value
2-gradation (monochrome) is processed by 1-bit data. Within the scanner, the image
controller unit in the scanner controller processes the data in 2-gradation. When the
monochrome processing is selected, data with 256-gradation will be processed as 2-
gradation data in monochrome by the prescribed threshold value after the normal
processing of 8-bit data is completed.
1.5.4 Scanner cartridge detection
The scanner cartridge detection within the printer is performed by DIA, DIK, and
SCHKR. The internal register setting within the scanner cartridge between DIA and
DIK is 5.6K ohms, and between DIK and SCHKR is 22K ohms.
1.5.5 Calibration operation based on the white calibration sheet
In the calibration process, data such as the printer’s internal temperature, black level
data, and white standard data are sampled to be used as a reference in scanning, to
create the calibration data.
The scanner driver on the host computer retains the past 5 calibration data samples
and saves them in a file.
When a scanner operation is performed, a value from the compiled temperature data
that is within ±5°C of the printer’s internal temperature at present is downloaded to
the scanner controller.
The scanner driver requests calibration when there is no compiled data within ±5°C.
1.5.6 Scanning time and data size (reference)
The scanning time and scanning data sizes are listed below.
When the scanning data sizes are stored into the files, the scanning data sizes are
varied with the file format.
Measurement Conditions
· Host computer: DELL XPS T550 (Pentium III 550MHz, internal memory 256MB)
· Interface: Parallel interface, ECP mode
· Paper size: A4
· Scan time: from the start of the paper feed operation to ejection
Part 5: Appendix
BJC-3000
5-14
Scanning Modes
Scanning resolution Color Black & White
(H
××
V) Color Gray Scale ( 8bit ) Mono (1 bit )
720 × 720 Approx. 25Min.08Sec. Approx. 6Min.57Sec. Approx. 3Min.05Sec.
137261 KByte 45753 KByte 5719 KByte
360 × 360 Approx. 6Min.39Sec. Approx. 1Min.41Sec. Approx. 50Sec.
34315 KByte 11438 KByte 992 KByte
180 × 180 Approx. 3Min.16Sec. Approx. 1Min.09Sec. Approx. 32Sec.
8576 KByte 2858 KByte 357 KByte
90 × 90 Approx. 3Min.09Sec. Approx. 1Min.03Sec. Approx. 27Sec.
2143 KByte 714 KByte 91 KByte
TABLE 5-4 SCANNING TIME AND DATA SIZE (REFERENCE)