Slow Scanning Speed
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Check 1 To view the image on a monitor, set the output resolution to around 150 dpi. To print, set it to around 300 dpi.
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Check 2 Set Fading Correction, Grain Correction, etc. to None.
Refer to "Image Settings" for your model from Home of the Online Manual for details.
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Check 3 In IJ Scan Utility, deselect the Correct slanted text document / Detect the orientation of text document and rotate image checkbox and scan again.