IBM Ricoh FB750 - Manual (Page 52)

52
8-bit grayscale
Grayscale, in contrast, is scanned in 8 or 10 bits (output of 8 bits), a single channel of color, providing for 256
shades of gray.
1-bit black and white
Line-Art, Error Diffusion and Half-tone modes scan in single bit (either on or off) which is only black and
white, no shades or gradations of color. Error Diffusion and Half-tone use spacing of pixels to mimic
grayscale imaging.
Aliasing & Anti-aliasing
Jagged edges on objects or changes of colors within an image. Anti-alias is any software application which is
designed to eliminate aliasing in images.
Alpha Blending
Additional information is coded into each pixel for creating transparent materials.
Application Software for scanners
Applications are any software that manipulates scanned images or text in some manner. Different software
has different functions: some allow you to manipulate and modify an image (see Imaging Software) and some
allow you to convert a scanned document into editable text (see OCR).
ASCII text
Plain text without any fonts or formatting codes (including line breaks in most cases). Most word-processors
can import ASCII text.
Aspect Ratio
This is the ratio of the width compared to the height in a rectangle. 1.0 would be a square.
BBS
Bulletin Board Service. Computers setup so that other computers can connect (logon) directly to them. The
purpose of most BBSs is to allow the transfer of files, other data, and typed communication. The graphics
used on most BBSs is ANSI, a primitive form of graphics based on ASCII with color and shades codes added.
BIOS
Basic Input/Output System and a program code in the permanent memory (ROM) of a computer, which
performs the self-test and several other functions during system startup. By changing values in the CMOS
(see below), you can change how the computer deals with its peripherals, its hard drive(s), and many other
things.
Bit
The smallest unit of memory in the computer is called a bit. A bit can be set to either on or off (1 or 0).
Greater bit-depth (more bits per pixel being used) allows for more complex image information which can
render a clearer image. However, more bits per pixel do create a bigger file even when scanning at the same
resolution.
Bit-depth
The number of bits in pixel, the bit-depth is divided equally into the number of color channels.