Acer ScanWit 2740S - Scan Speed Measurements
Most of the measurements were made in the so-called
"High Quality 24 Bit" mode at 2700 dpi resolution with ICE
as this is the most interesting scanner setting. The 48 bit color deep (36 bit internally) would be an important issue
too in general. But, I could not find any quality improvement using this! Hence, the 48 bit mode only seems only to
increase time and memory consumption for the Acer ScanWit 2740S scans.
| |
Acer User Manual |
Pentium P4 |
Pentium Pro |
AMD K6 |
| Warming up |
not mentioned |
up to 45 s (on need) |
| Preview |
not mentioned |
34 s |
? |
? |
| "High Speed", 2700 dpi, ICE |
"a 2700 dpi scan
within 40 sec.",
no further
dependencies
mentioned |
129 s |
? |
? |
| "High Quality 24 bit", 2700 dpi, ICE |
155 s |
570...720 s |
2400 s! |
| "High Quality 24 bit", 1350 dpi, ICE |
124 s |
165 s |
? |
| "High Quality 24 bit", 900 dpi, ICE |
62 s |
? |
? |
| "High Quality 24 bit", 675 dpi, ICE |
32 s |
80 s |
? |
| "High Quality 24 bit", 450 dpi, ICE |
32 s |
? |
? |
| "High Quality 24 bit", 300 dpi, ICE |
32 s |
68 s |
? |
| "High Quality 24 bit", 200 dpi, ICE |
32 s |
67 s |
? |
| "High Speed", 2700 dpi, without ICE |
47 s |
? |
? |
| "High Quality 24 bit", 2700 dpi, without ICE |
47 s |
? |
? |
| "High Quality 24 bit", 200 dpi, without ICE |
13 s |
15 s |
? |
| "High Quality 48 bit", 2700 dpi, ICE |
310 s |
830 s |
? |
Test Environment
| |
Acer Manual
System Requirement |
My
Pentium P4 |
My
Pentium Pro |
My
AMD K6 |
Remark |
| Processor |
"Pentium-level CPU" |
Pentium P4, 1.9 GHz |
Pentium Pro, 200 MHz |
AMD K6, 233 MHz |
1) |
| RAM |
"with 32 MB RAM" |
1536 MB |
192 MB |
64 MB |
2) |
| Operation System |
various |
Windows 2000 |
Windows NT 4.0 |
Windows ME |
3) |
Remarks:
| 1) |
Earlier, I owned a 60 MHz Pentium too. This should be enough when you follow the Acer system requirements. However, it isn't.
I got nearly 100 % CPU usage during scan time at the Pentium Pro 200 MHz and at the AMD K6 233 MHz as well.
Hence, the systems were practically unusable for other tasks during the long scan periods shown above. -
But, this shouldn't be an issue for a Pentium III CPU or higher. |
| 2) |
In practice, memory allocation (RAM plus virtual) in Photoshop (LE) is: 4 * image size * number of images.
Example: Scan of 6 images in the film holder at 2700 dpi, 24 bit each: 6 * 4 * 27 MB = 648 MB RAM usage!
You should not scan more images than your system has physical RAM. Otherwise, the scan speed will become worse once more
and even the operation system might crash. Furthermore take care, that the RAM will not be de-allocated up to Photoshop (LE)
is ended. For instance, I just scanned one single slide (1 * 4 * 27 MB = 108 MB) within one Photoshop (LE) session at my Pentium Pro
with 192 MB RAM for this reason! |
| 3) |
Although, the MiraPhoto 2.0 scanner software works below all of the tested operation systems, it behaves unstable everywhere, i.e.,
it tends to malfunction and to crash as well or even brings the whole system down.
Thereby, it seems not to make any difference if the English or German driver version has been installed. |
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