Technical data
T
T
E
E
C
C
H
H
N
N
I
I
C
C
A
A
L
L
Q
Q
U
U
E
E
S
S
T
T
I
I
O
O
N
N
S
S
A
A
N
N
D
D
A
A
N
N
S
S
W
W
E
E
R
R
S
S
22
T
T
E
E
C
C
H
H
N
N
I
I
C
C
A
A
L
L
Q
Q
U
U
E
E
S
S
T
T
I
I
O
O
N
N
S
S
A
A
N
N
D
D
A
A
N
N
S
S
W
W
E
E
R
R
S
S
WHICH RESOLUTION FOR WHICH PURPOSE?
Purpose Resolution Colour depth
colour picture, print-out 150 dpi 24-48 Bit
greyscale pictures/photos 200 dpi 10-Bit
text recognition 300 dpi 1-Bit
For greater quality requirements, higher values can be set, but
these require far more memory and therefore slow down the
speed of the scanning process.
Text recognition functions optimally with the settings given.
MEMORY REQUIREMENT FOR DIFFERENT RESOLUTIONS
Scanning an original with an area of 10 x 10 cm uses the follow-
ing amount of memory with the resolution stated:
100 dpi 150 dpi 300 dpi 600 dpi
line picture 19,5 Kb 44 Kb 175 Kb 703 Kb
greyscale 156 Kb 352 Kb 1.37 MB 5.5 MB
colour 469 Kb 1 MB 4.12 MB 16.5 MB
WHAT DOES THE FOLLOWING MEAN?
Colour depth Number of colours which can be represented simul-
taneously.
1-Bit = 2^1 = 2 colours = black/ white
8-Bit = 2^8 = 256 colours
16-Bit = 2^16 = 65.536 colours
24-Bit = 2^24 = 16.777.216 colours
Dpi Unit of resolution, number of dots per inch.
OCR Text recognition
Pixel Picture dot
Resolution The ratio of the pixels (dpi) shown in the area.
TWAIN Standard – this makes the exchange between the
scanner and the computer possible.