I.R.I.S. IRIScan Pro 3 Wi-Fi User Guide - Manual (Page 52)

User Guide
6-7
Resolution A good control of the resolution results a good detail of an image that
scans. The resolution is measured by 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. Available resolutions are 75, 100, 150, 200,300, 400 and
600. Or you may choose your desired value by clicking the box in the
right side of the drop down list and press the arrow key to select your
desired value and then click the Add button to include it in the drop
down list. Note: The resolution is up to 300 dpi if an imprinter or a
MICR reader is installed or connected to the scanner.
Resolution: 75 dpi Resolution: 150 dpi
Invert Reverses the brightness and the colors in the image. The default setting is
Black on a White background. Reverse mode is White on a Black background.
For color images, each pixel will be changed into its complementary color at
the command of Invert.
Black on White
White on Black
Scan
Source
Choice:
Auto Document Feeder: Used to scan multiple pages.