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Resolution, zoom, and maximum scannable area
The ID information provides you the following values.
R
MAX
(in dpi) : The maximum scannable area available
X
MAX
(in dots) : The maximum main scan value (at the maximum
resolution, 100% zoom)
Y
MAX
(in dots) : The maximum sub scan value (at the maximum
resolution, 100% zoom)
Based on these values, you can calculate the maximum scannable area
for various resolution and zoom settings according to the following
formulas.
Main scan (in dots)
nx = INT
X
MAX
R
MAX
×
R
X
× H
X
100
Sub scan
ny = INT
Y
MAX
R
MAX
×
R
Y
× H
Y
100
Based on these values, the limits of the parameters for the
ESC A command are as follows:
n
1
(main scan skip length) : 0 ≤ n
1
≤ nx − 8
n
2
(sub scan skip length) : 0 ≤ n
2
≤ ny − 1
n
3
(main scan reading length) : 8 ≤ n
3
≤ 8 × INT
nx − n
1
8
n
4
(sub scan reading length) : 1 ≤ n
4
≤ ny − n
2
n
1
+ n
3
≤ nx
n
2
+ n
4
≤ ny
Note:
The limits of the n
3
parameter depend on your scanner model. See
your scanner’s manual for details.
2-36 Command Usage