I.R.I.S. IRIScan Pro 3 Cloud Button Manager - Manual (Page 27)

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Resolution:
Resolution A good control of the resolution results in a
good detail of the scanned image. The
resolution is measured in dots per inch (dpi).
Normally, the greater the dpi number, the
higher the resolution and the image file size.
Be aware that greater resolution takes more
time to scan, and more disk space for the
scanning image. For your information, an A4
size color image scanned at 300 dpi at True
Color mode consumes approximately 25 MB of
disk space. A higher resolution (usually means
over 600 dpi) is only recommended when you
need to scan a small area at True Color mode.
Choose a resolution value from the drop down
list. The default value is 200 dpi. The available
resolutions are 75, 100, 150, 200, 300, 400
and 600. Or you may enter your desired value
by clicking the box in the right side of the drop
down list and type your desired value.
Resolution: 75 dpi
Resolution: 150 dpi