Glossary of Technical Terms
The following is a glossary of scanning related technical terminology.
8 bit grayscale
contains 256 possible shades of gray.
24 bit color
contains a possible 16 million distinct colors. This method of scanning produces the largest file size.
32 bit color
contains a possible 16 million distinct colors as with 24 bit color and the other eight bits are used as a separate layer for representing levels of translucency in an object or image.
provides a way to store a binary image, that is, an image in which each pixel is either black or white (or any two colors).
is the number of bits used to indicate the color of a single pixel in a bitmapped image. (See 8 bit grayscale, 24 bit color and 32 bit color above).
refers to removing excess information that is surrounding an image of the original document but is not part of the image, like a white border.
is the ability of a scanner to detect that the item being scanned is not straight and to realign the scanned image to be straight.
DPI (dots per inch),
the number of pixels per inch used in an image and determines the resolution of the image. See also resolution.
indicates two sided documents. A duplex scanner will scan both sides of a document at the same time.
is a conversion of a multi-tonal image to a bitonal image in such a way that the impression of a multi-tonal image is retained.
represents the length and width dimensions of the scanner, indicating how much space is required for the device.
stands for Joint Photographic Experts Group, the committee that created the JPEG standard. It defines how an image is compressed into a stream of bytes and decompressed back to an image.
Mbit/s (megabits per second)
– the number of bits of data that are transferred per second. 1 megabit = 1,000,000 bits.
OCR (Optical Character Recognition)
is electronic conversion of scanned images of handwritten, typewritten or printed text into machine-encoded text.
PDF (Portable Document Format)
is an open file format created by Adobe in 1993 and is an accepted standard for digital file sharing.
is degree of fineness with which an image can be recorded or produced, often expressed as the number of pixels per unit of length (typically an inch).
technology provides a code-free client via any web browser for all Image Access scanners. Scan2Net frees the host PC from all image related and time critical tasks.
TIFF (Tagged Image File Format)
is a storage format widely supported by image manipulation software applications.