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.
- Bitmap 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).
- Color depth 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).
- Crop 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.
- Deskew 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.
- Duplex indicates two sided documents. A duplex scanner will scan both
sides of a document at the
- Enhanced halftone 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.
- Footprint represents the length and width dimensions of the scanner,
indicating how much space is
required for the device.
- JPEG (jpg) 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.
- Resolution 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).
- Scan2Net technology provides a code-free client via any web browser
Image Access scanners. Scan2Net frees the host PC from all image related and time
- TIFF (Tagged Image File Format) is a storage format widely supported by