X-Rite i1 Pro Manuel De L'utilisateur page 16

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Scan Measurement
Virtual aperture technology
During a scan measurement the i1Pro device is performing 200 measurements per
second. The automatic patch detection of the device identifies useable measurements
made on a patch and unusable measurements made between two patches. Valid
measurements on a patch are averaged and the device reports the averaged result to
the software. Thanks to this technology the virtual aperture of the i1Pro device adapts to
the length of a patch. For best measurement results the length of the patches on your
test chart should be selected based on the resolution of your printer. For printers with
lower resolution or a grainy screening you should increase the length of the patches on
your test chart.
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