Scan Resolution (1.4) - HP Designjet 5500mfp Color Manual

2.3.1.2 Scan Resolution (1.4)

You can specify the scanning resolution decided in point 1.4 of section 2.2 in the Scan
Resolution setting of the Scan tab (or in the Copy Quality setting under the Settings
button of the Copy tab).
If you select a scanning resolution other than the predefined ones, please make sure that
it is a multiple or sub-multiple of 600dpi, otherwise picture artifacts may appear in the
copy.
As a rule of thumb, the scanning resolution (for best print mode and large format
images) should be 150dpi x (Output Size/Input Size); therefore, if the original is not
enlarged (Output Size = Input Size), a 150dpi resolution is sufficient. If the original is
enlarged four times, a 600dpi resolution is needed.
If the image contains fine details (CAD drawings, fine art, maps), you may consider
scanning at a higher resolution.
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Color Reproduction for the HP Large Format Color Copiers family: cc800ps, 815mfp, 5500mfp and 4200 scanner