Epson EXPRESSION 1640XL User Manual page 96

7. Compare the left edges of the scales on the scanned image; the
starting points of the scales should match exactly. If both
scales start at the same line (for example 0), skip to step 11.
Otherwise go to the next step.
Matching
A
B
8. See the left edges of the scales of the scanned image. Every
line of the scale that is missing is equal to 0.4 for mathematical
purposes. Then calculate the adjustment angle using the
following equation.
The adjusting angle = (scale A - scale B) / 4
For example:
If scale A starts at line 0, then 0
scale A = 0
If scale B starts at line 2, then 2
scale B = 0.8
(0 - 0.8)/4 = -0.2
The angle you need to adjust the adjust pin = -0.2
4-30
Using Your Scanner
starts at 0 A
starts at 0 B
0.4 = 0; the value for
0.4 = 0.8; the value for
Do not match
starts at 0
starts at 2