HP 815MFP - Manual (Page 71)

hp designjet 815mfp & scanner 4200 65
tell me about the scan options
preview dpi
Determine the image resolution (between 50 and 300 dpi) for on
screen previewing. Lower resolutions give faster previewing.
scan speed
Sometimes, the performance of your workstation will cause the
scanner to make repeated “back-ups” during scanning in order to
ensure correct and continuous processing of scanned data. Back-
ups can be avoided by reducing the maximum scanning speed thus
refitting the scanner’s performance to that of your workstation.
rewind paper
After scanning, your original will normally be found hanging at the
back of the scanner. If the scanner is placed close to a wall, it may
be difficult to access the original in order to remove it from the
scanner. However, if the Rewind Paper option is selected, the
original will be rewound back to its starting position after scanning.
In this case, it can be ejected and removed from the front of the
scanner.