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aliasing
The visibly jagged steps along angled lines or object edges that result
from sharp tonal contrasts between pixels. Seen in both black-and-
white images and color images. Sometimes called Jaggies.
anti-aliasing
A technique that smooths transitions between pixels, reducing the
jaggedness of curved lines.
approximate size
Reflects the amount of disk space a scan would require if saved to
your computer. Approximate Size value does not apply if the output
type for the scan is set to text; it only applies to an image
representation of the scan.
auto(matic) cropping
Automatic cropping displays only the item(s) detected on the scanner
bed, not any of the surrounding area.
automatic document feeder
Abbreviated ADF, it is an optional accessory that allows you to scan
multiple pages.
Auto(matic) resolution
A feature of the scanning software that automatically applies the
optimal output resolution to the selection area. For example, output
resolution is automatically set to 200 when the True Color output type
is selected, and set to 300 for the Black & White Bitmap (raster) output
type.
b
bit depth
The number of bits used to define the shade or color of each pixel in an
image. A 1-bit image is black and white. An 8-bit grayscale image
provides 256 shades of gray. An 8-bit color image provides 256
indexed colors and is associated with a specific palette or color table.
A 24-bit image provides over 16 million colors. The greater the bit
depth, the larger the size of the saved file. See also file size.
bitmap
A type of black-and-white, gray, or color image or picture made up of a
matrix of individual pixels or dots. Often referred to as raster, raster
bitmap, or raster image.
black & white bitmap
Black & white raster bitmaps contain only black pixels and white pixels,
no colors or shades of gray. Each pixel represents one bit.
Black & White Threshold tool
The Black & White Threshold tool lets you change the dividing point for
black-and-white pixels in an image that uses the Black & White Bitmap
(raster) output type. All pixels below the threshold will be output as
black, and all pixels above the threshold will be output as white.
border
A line surrounding the scanned image indicating scanning boundaries.
Clicking the image reveals a selection border and handles that are
used to define the scanning region.