User`s guide

Appendix A:Scanner and Printer Specific Features
96 - ScanShop User’s Guide
Bits Per Pixel
Four levels of bits per pixel are offered: 1 bit/pixel for black and white, 4or 8
bits/pixel for gray scale, and 24 bits/pixel for color.
Brightness
The brightness slider bar varies the brightness of the image, ranging from darkest
on the left to lightest on the right.
Contrast
The contrast slider bar allows you to vary the image contrast. Sliding it to the
right increases the contrast.
Auto Background
Auto Background is an image enhancement feature only available on
Hewlett-Packard scanners. This function adjusts the variations in the background
to even out the foreground.
Auto Document Feeder
If the ADF is installed, its checkbox will appear “solid.” When available, clicking
on this checkbox alternately enables and disables use of the ADF for scans.
If you try to scan with the ADF selected but have no paper inserted in the ADF,
an error message will appear at the bottom of your image display window. The
Preview function is disabled when the scanner is in ADF mode.
Zoom X, Zoom Y
Entering percentage values in these controls lets you change the magnification of
the scanned image, while preserving the DPI value. For example, choosing a
value of 200% along a particular direction will cause twice as many pixels to be
used to represent the same length, so that at a constant DPI, that image will be
twice as long in that direction.
Document Size
In selecting the size of the area to be scanned, the following standard document
sizes are typically offered:
• letter