Q: The SilverFast user interface has an entry field for Q-factor. What does the Q-factor actually do?
A: In SilverFast you have the possiblility to determine the scan resolution by setting the Quality Factor (Q-Factor). This Q-Factor indicates the relation between line screen resolution (lpi) and scan reslolution (ppi resp. dpi).
A Q-Factor of 1.5 means that the scan resolution is 1.5 times larger than the line screen resolution.
How to calculate the maximum scan resolution with no information loss.?
desired output sreen x quality factor x scaling factor = scan resolution
Example
scanning a photo that is destined to be printed at a print pattern of 175lpi, and the photo is scanned 1:1 size (not enlarged or downscaled) this is your calculation:
175lpi x 1.5 x scaling factor (1:1 = output scaling 100% = 1) = ? 175lpi x 1.5 x 1 = 262,5dpi
SilverFast runds it off to 262dpi
Bookmarks