HP ScanJet Pro 4500 fn1 - Manual (Page 54)

Image quality problems
Vertical colored stripes appear on the printed page
Dust can build up on the scanning strips inside the document feeder and cause artifacts in scanned images.
Clean the scanning strips with a soft, lint-free cloth that has been sprayed with a mild glass cleaner.
Scanned images are not straight
● Verify that the document feeder guides are centered on the scanner and set to an appropriate width for
the original being scanned. Make sure the paper guides touch the edges of the original.
● Windows: Use the Auto-Straighten feature to straighten content that is skewed relative to the page
dimensions in the source document. Use the Auto Detect Size feature to deskew page images that
might have become skewed during the scanning process.
The scanned images have streaks or scratches
For information on cleaning the scanner, see the Care and maintenance section of the User Guide.
● Check that the originals are clean and unwrinkled.
● Clean the scanner glass.
Scanned image is fuzzy
● Check for any obstructions in the scanner paper path and make sure the paper width guides are
positioned appropriately. Try another scan.
● Verify that the document is not fuzzy.
The scan is completely black or completely white
● The item might not be placed correctly in the document feeder. Make sure that the item being scanned
is placed face up in the document feeder.
● Windows: If scanning to a black and white image, make sure the black and white threshold is not set to
either extreme . Setting the threshold to an extreme will result in an image that is all white or all black.
● OS X: If scanning to a text image using the Image Capture application, set Image Correction to Manual
and use the Threshold slider bar to adjust the threshold.
The bottom of the scanned image is cut off
By default, the scanning software can scan media that is up to 356 mm (14 in) long.
Verify that the page size selected in the scanning software (or the scan shortcut selected) will accommodate
the length of the document being scanned.
46 Chapter 5 Solve problems ENWW