HP Officejet 6500A Plus - Manual (Page 134)

◦ The accuracy of the software depends on the image quality, text size, and
structure of the original and the quality of the scan itself. Make sure that your
original has good image quality.
◦ Colored backgrounds can cause images in the foreground to blend too much.
Error messages appear
"Unable to activate TWAIN source" or "An error occurred while acquiring the
image"
◦
If you are acquiring an image from another device, such as a digital camera or
another scanner, make sure that the other device is TWAIN-compliant. Devices
that are not TWAIN-compliant do not work with the HP software.
◦ Make sure that you have connected the USB cable to the correct port on the back
of your computer.
◦ Verify that the correct TWAIN source is selected. In the software, check the TWAIN
source by selecting Select Scanner on the File menu.
Scanned image quality is poor
The original is a second-generation photo or picture
Reprinted photographs, such as those in newspapers or magazines, are printed by
using tiny dots of ink that make an interpretation of the original photograph, which
degrades the quality. Often, the ink dots form unwanted patterns that can be detected
when the image is scanned or printed or when the image appears on a screen. If the
following suggestions do not solve the problem, you might need to use a better-quality
version of the original.
◦
To eliminate the patterns, try reducing the size of the image after scanning.
◦ Print the scanned image to see if the quality is better.
◦ Make sure that the resolution and color settings are correct for the type of scan job.
Text or images on the back of a two-sided original appear in the scan
Two-sided originals can "bleed" text or images from the back side to the scan if the
originals are printed on media that is too thin or too transparent.
The scanned image is skewed (crooked)
The original might have been placed incorrectly. Be sure to use the media guides when
you place the original on the scanner glass. For more information, see Load an original
on the scanner glass.
The image quality is better when printed
The image that appears on the screen is not always an accurate representation of the
quality of the scan.
◦
Try adjusting your computer monitor settings to use more colors (or levels of gray).
On Windows computers, you typically make this adjustment by opening Display on
the Windows control panel.
◦ Try adjusting the resolution and color settings.
The scanned image shows blots, lines, vertical white stripes, or other defects
◦
If the scanner glass is dirty, the image produced does not have optimum clarity.
See Maintain the printer for cleaning instructions.
◦ The defects might be on the original and not a result of the scanning process.
Chapter 8
130 Solve a problem