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Default value: Varies according to scanner model. See Appendix B for
details.
Explanation:
This command specifies the scanning area as a rectangle measured
from the origin, with lengths for the main scan and sub scan. The
setting is made in units of dots (pixels).
The maximum values are determined by the current resolution (ESC
R) and zoom (ESC H) settings. The values available for the scanning
area depend on the scanner model, and can be calculated using the
maximum scannable area and the maximum resolution values
obtained with the ESC I command.
The values for parameters denote:
n1: main scan offset length (2 bytes)
n2: sub scan offset length (2 bytes)
n3: main scan reading length (2 bytes)
n4: sub scan reading length (2 bytes)
Offset lengths and scanning length
The offset lengths determine the offsets of the starting point of the
specified scanning area, as measured from the origin. When these
values are 0, the scanning area starting point is the origin. When they
are specified as 10 dots each, the scanning area starts from dot 11 for
the main scan and sub scan.
The scanning length determines the length and width of the scanning
area, starting from the origin or from the offset position.
3-30 Command Reference