There are different ways to measure the speed of a scanner, but I think the right one is to measure the time it takes to perform a scanning task which can be much longer than the time the scanning carriage takes to get back to its initial position. So, I start my stopwatch the moment I click on the Scan button and stop it the moment the scanned image is fully transferred into the control program, i.e. into the image editor.
I used two originals of standard form-factors: a 10x15cm (4x6”) photograph and a 35mm slide. The samples were digitized at 24-bit color depth and in 600dpi, 1200dpi, 2400dpi and 4800dpi modes. The results are presented in the following diagram:
The scanner took a total of 20 minutes to complete the task at its optical resolution (4800dpi), although the driver had transferred the image in 10 minutes. The rest of the time the computer was busy writing the huge temporary file on the hard drive.
In order to check how fast Digital ICE technology is in this scanner, I digitized a standard 35mm slide in three modes: at the standard settings, with Digital ICE enabled in Quality mode and with Digital ICE enabled in Speed mode. You can see there’s a small difference between Quality and Speed mode at low scan resolutions, but considerable at high resolutions.
You can use these numbers to compare the speed characteristics of the Perfection 4490 with those of other scanner models we have tested on our site.