Thanks. But I dont' know how to compare. Some specs are msec / line
and some are by pages.
It takes some math, but you can compare.
One thing you need to know, is what resolution, the manufacturer is
specifying the per page spec.
For msec / line you take the time for each line (msec multiply by the number
of lines).
Example:
The Epson 1240U spec for color says 7.0 msec/line (approx.) at 1200 dpi.
If you scan at 1200 dpi, you have 1200 lines per inch multiply by the length
of the page in inches (11 for letter) and that gives you the number of lines
per page.
1200 * 11=13200 lines/page.
To get the time for the whole page, multiply lines/page by sec/line.
Convert msec to sec. 7 msec /1000=.007 sec.
Multiply sec/line by number of lines per page.
..007 * 13200=92.4 sec per page.
From the spec for the 1240U, it should take 1 minute 32.4 seconds to scan a
letter size document in color at 1200 dpi. (You should never!)
You can compare the 1240U's scan speed at 1200 dpi (1:32.4) to any other
scanner at the same resolution (DPI).
If the new scanner is 2400 dpi and it takes the same 1:32.4/page, then the
new scanner is twice as fast because it is scanning twice the number of
lines per page in the same time.
You would never want to scan a 8.5 x 11 inch document at 1200 dpi. File size
is humungous with no real benefit (there is not that much detail in a paper
document).
I timed my Canon 8400F at 300 dpi and scanned a color 8.5 x 11 document. It
took 16 seconds for the whole page. (I am using USB 2.0). I think that is
pretty fast. It sure beats my old AcerScan 620ST.
FYI, I tried scanning a 8.5 x 11 at 1200 dpi on the Canon 8400F, it took 3
min 37 seconds. The memory size was over 300 Megabytes. Complete with all
the warning messages.
