IBM Ricoh FB750 - Manual (Page 24)

24
The PowerScan TWAIN interface is divided into two windows: the Control Window and the Preview
Window. The Control Window is further divided into sections to help guide you through all the
scanning settings. The main part of the Control Window has the controls you are most likely to
modify for your image and has drop down menus in three sections to configure your scan. The tool
and menu bars at the top of the Control Window give you further controls for the scanning process.
The buttons at the bottom of the Control Window are where you actually initiate the preview or scan.
To the left of the Control Window is the Preview Window that will display your previewed image.
Note: Set only those controls that are necessary for your current scanning task.
Image Types and Scanning Modes
The ImageReader PowerScan gives you flexibility to scan a variety of originals in a variety of ways.
You should choose the mode that best suits your original and your intended use.
Image Type
There are four Image Types for you to choose.
Color Photo
Color images are composed of three channels of a predefined bit depth: red, green, and blue (RGB).
The number of bits in a channel provided the number of color combinations or shades that are
possible. The ImageReader PowerScan scans (hardware) in 30-bit (3 channels of 10-bits each) color
providing for over 50 billion color combinations. This allows for more vivid color reproductions
with subtle gradations of hue. The output is 24-bit (3 channels of 8-bits each), producing over 16
million possible color combinations and providing for a relatively photo-realistic image. 24-bit
images are also called True Color.
Color pictures will turn out best if you scan them in Color.
Color scanning, of all the modes, uses the most resources and will create the largest image files.
Gray Photo
Grayscale images are characterized by 256 shades of gray. The ImageReader PowerScan scans your
image with 10 bits of gray (hardware) but outputs 8 bits (256 colors).
Grayscale is useful for converting color pictures into “black and white” or for retaining a
higher quality when scanning “black and white” photos.
Grayscale images take up more storage space than any of the single-bit images and require more
resources during the scan, but they are not nearly as heavy in resource use as is color