IBM Ricoh FB750 - Manual (Page 25)

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B/W Line Art
Line Art captures the image in black and white only (single-bit) with no intermediate shades of gray.
Because there is very little image information that has to be stored, a LineArt scanned item takes up
very storage space.
Many OCR programs require an image be scanned in Line Art. This mode is also useful for
scanning documents.
B/W Halftone
Halftone is single-bit (only black and white). Halftone uses variations in dot size to simulate
grayscale imaging. Some of the image detail is lost with Halftone, so it would not be as useful for
photos.
Halftone is better suited to pen and ink style drawings, the details of which would be lost
with a LineArt scan.
Original
Only one type of original is possible with the PowerScan: Reflective (Flatbed). The PowerScan
driver does not support a transparency adapter.
Scan Mode
You can specify if you want your image to be configured for a faster
scan or for a slower but higher quality scan. If the emphasis is on the
quality of the completed image, choose Quality mode. If speed is
more important, choose Speed.
Image Control
These features will set the size of the image as well as heavily influence the finished file size.
Resolution
The resolution of an image determines the number of dots or
pixels per square inch of in image (dpi). Generally, denser pixel
coverage per square inch (higher resolution) results in sharper
images.
There are two types of resolution: Optical and Interpolated. Optical is the resolution that is accom-
plished by the operation of the hardware; Interpolated is achieved through the software scanner
driver. The resolution setting in the TWAIN interface is the Interpolated resolution.