User Guide
Table Of Contents
- VirtualReScan 3.5 User’s Manual
- Contents
- How to Use This Guide
- Overview
- Operating VRS
- Introduction
- Scanning with VRS Default Settings
- Kofax VRS Scan Interfaces
- Configuring VRS Before You Scan
- Using VRS While You Scan
- VRS Advanced Properties Dialog Box Overview
- VRS Restore Default Values Utility
- Long Paper Support
- VRS Non-Interactive Mode
- Enhanced Bar Code Engine
- Patch Code Recognition
- Advanced Color Processing
- Index
Chapter 2
70 VRS User’s Manual
Note The Böwe Bell + Howell Spectrum series scanners support color dropout. All
scanners in the series support front and back side color dropout except for the Böwe
Bell + Howell 8080 SB and Böwe Bell + Howell 8080 SC, which support single-sided
scanning only. For these scanners, the back side options for color dropout are
disabled.
JPEG (Joint Photographic Expert Group) is a standardized image format designed to
compress color and grayscale images. In the JPEG Compression group of the Color
tab, you can activate JPEG compression via the Enabled check box. When the Enabled
check box is selected, you may then select an image quality level of Good (65), Better
(80), Best (95), or Custom.
When the Custom image quality level option is selected, both a YUV value and a
Custom JPEG Compression Value may be set. The Custom value has a range of 1 to
100, with a default of 65. As a very general example, setting the JPEG Compression
Value at 100 would probably compress the image so lightly that it would be near its
original size; a JPEG Compression Value of 10, however, could result in major data
loss.
You may type a custom quality JPEG Compression Value into the text box provided,
or use the up and down arrows to select a value. Because results from the Custom
JPEG Compression Value cannot be predicted with certainty, use this setting with
caution. The key is to achieve an agreeable balance between better performance
(through optimum compression) and quality of the images. Avoid compression that
speeds up scanning yet loses necessary data.
YUV, a color-encoding scheme involving luminance (frame and field brightness or
“Y”) and chrominance (color information or “UV”), may be selected if desired from
the drop-down list. The choices for YUV may vary by scanner. The Fujitsu fi-4990C,
Fujitsu fi-4860C, and the Böwe Bell + Howell Spectrum series choices are 4-4-4 or 4-2-
2, with a default of 4-2-2. When the JPEG Compression Enabled check box is clear, the
Quality, YUV, and quality Value choices are disabled.