Ricoh IS450 - Manual (Page 59)

45
Functions
Scan
This function scans an original once the scanning area, scanning composition, resolution, and
other values have been set.
When setting these values, consideration should be given to the original that is to be scanned and
to the output device (display, printer, etc.). For example, it is meaningless to scan an original at
high resolution if the resolution of the output device is lower than the scanning resolution,
especially because high-resolution scanning uses a great deal of memory and requires more
processing time.
Scanning Composition
There are three scanning composition modes: binary scanning, halftone scanning, and multi-
value scanning.
❖ ❖ ❖ ❖ ❖ Binary scanning
This mode scans the original in black and white. This mode is used to scan originals that
consist only of text, line drawings, and other elements that lack intermediate colors.
❖ ❖ ❖ ❖ ❖ Halftone scanning
This mode scans the original in pseudo-halftones created by dots. This mode is used to
output an original that contains intermediate colors, such as a photo, on an output device that
can only express binary per pixel, such as a laser printer.
❖ ❖ ❖ ❖ ❖ Gray Scale scanning
This mode scans the original with 16 or 256 gradations. This mode is used to output an
original that contains intermediate colors on an output device that can express different
gradations for a single pixel, such as a Dye Sublimation printer or a display.
Original Binary
Halftone Gray Scale