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Glossary

Adaptive Thresholding
A technology developed by Widecom which allows the SLC 936C to create background and foreground differentiation in monochrome images on a per line basis so that clear images are created from faded old blueprints

 

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Additive Colors
The additive primary colors are red, green, and blue. These primaries represent the three main components of white light. Used seperately or together, these three colors of light are mixed in equal parts to produce white.


Annotating and Rubberstamping Tools
This is a tool used in various imaging softwares which allows users to edit images and utilizing a "rubber stamping" effect that stamps images with phrases and symbols.


ANSI
(American National Standards Institute for Engineering) One of three popular drawing size standards.


Automatic Color Reduction
This option will scan the document and automatically select the 16 different shades of colors and reduce the full color image to 16 colors.

Bi-Level Raster
This is a image that is in raster format, but it is only on two colors levels: (most commonly black and white )


BIOS
Basic input output system'. Very basic software comes in the ROM of a PC. This is computer set up utility which allows user to configure computers settings to hardware and software specifications.


Bitmapped Image
This image that is a computer file representing a line-art image that was scanned with a scanner.


Brightness Adjustment
An additive adjustment for the intensity of primary colors. A feature on the scanner that allows the operator to compensate for light or dark originals.


Calibration
Adjusting equipment so that it performs in accordance with an establishment standard e.g scanner calibration, minimizing color deviation.


Calibration Paper
The medium used to feed into scanner so that it can calibrate.


CCD
Charge Coupled Device, the CCD is the image sensor in a scanner, that converts light to voltages. These voltages are converted by the scanner into the image.


CMYK
The subtractive printing colors. Cyan, Magenta, Yellow, and Black.


Color
Electromagnetic energy that exists in the form of wavelengths creates the perception of color. There is a huge difference between the visible spectrum we can see with our eyes and the colors which can be reproduced.


Color bit depth
(A pixel with two choices is known as one-bit image,or two raised to the power of one). Adding more bit information increases the number of color options. The number of potential color options for a pixel is called color bit depth.


Color Management System
This software increases the accuracy of color interchange between scanners, displays and printers based on profiles for each device.


ColScan
Imaging software developed by Widecom for use with the SLC836C


Compressing
Reducing file sizes of images by encoding the data.


Configure
To modify hardware or software to specifications.


Constant Thresholding
A technology used in certain scanners which allows the scanner to scan at one level.


Contamination
This relates to the scanner's effieciency in terms of scanning. Dust and contamination on the scanner glass can interfere with scanning properly.


Contrast
The tonal range between light and dark in an image. Proper contrast is important for an image to appear realistic.


Conversions
This is a transformation from one set of parameters to an equivalent set.


Deskew
Feature in imaging software which removes the skew from the image.


Despeckle
Feature in imaging software which removes unwanted noise from the image.


Deviant-Aspect-Ratio
This is the ratio where x and y resolutions are not equal.


Dithering
If the viewer is sufficiently distant from the printed page or display, the value of neighboring pixels to acheive an apparent improvement in the number of levels or colors that can be reproduced.


DPI
Dots Per Inch


Dynamic Range
A measurement used to measure scanner quality, the density difference between highlights and shadows.


Expansion Cover Shield
The plastic cover piece which covers the expansion slot behind the computer.


Expansion Slot
Jack where parallel port card is inserted in computer.


Gamut
The color range scanable, printable or displayable by a device e.g. if some of the displayable colors are outside of the gamnut of the printer, they cannot be printed.


Grayscale
Refers to the range of 256 gray tones that make up an image.


Hue
A measurement of color as can be related by pointing towards a certain color on the color wheel. Hue indicates the relative redness, blueness, greenness, yellowness, etc. of a color.


Index Color
Index color is the provision of a relatively small number (256 discrete colors in a color map or palette).


Interface Card
Circuit board in scanner to talk to computer.


ISA Bus speed
It is the rate at which the data is transferd in the PC ISA bus.


ISO
One of three popular drawing size standards. (International Standards Organization for Engineering Drawings)


JPEG Compression
Joint Photographic Experts Group Compression. A method to save storage space by compressing files. JPEG acheives a high degree of compression by discarding non-important picture detail.


LCD
Liquid Crystal Display. Very popular display found on most laptops and other hardwares.


Lossless Compression
File compression and subsequent de-compression without any loss of data.


Lossy Compression
File compression that will compress data to a high degree. When subsequently un-compressed data will have been lost.


Luminance
Attribute of a visual sensation according to which an area appears to emit more or less light.


LZW
Methods of lossless compression used with many file formats, developed by Lempel, Zev and Welch.


Palette
A set of colors available for an image.


Paper Sensor
The electronic device in the scanner which senses the presence of paper being fed in.


Parallel Port Cable
Used to connect various devices to the parallel port. (e.g. computer to scanner)


Parallel Port Card
Circuit board for computer to talk to scanner.


PCI bus clock speed
The speed at which the data transfers into the PCI Bus.


Pixels
A pixel is the small square picture element that is filled with color. Pixels come in various sizes and their size is expressed in terms of resolution.


Pressure-Release Lever
This is the lever which allows user to remove or adjust the document by pulling up on it.


Ram
Random Access Memory


Raster File
A picture composed of individual dots the way a scanner perceives it.


Redlining
This is a feature found in ceratin imaging softwares that allows user to edit image by using colored lines.


Resolution
Defines the level of detail that can be captured or shown by scanner, display, or output device.


RGB
Red, Green, Blue. The three primary components of white light.


Saturation
It is one attribute of color in the color space called HSV (Hue Saturation, Value). Saturation is a characteristic indicating the vibrancy or intensity of a hue.


Scan Area
Area which is specified to be scanned.


Scan-Head
Electronic device which performs actual scan.


Subtractive Colors
The subtractive primary colors: Cyan, Magenta, and yellow. As ink applied to a piece of paper by a printer, these colors absorb light and alter the colors seen by looking at the printed paper.


TIFF File Format
Tagged Image File Format. One of the most common graphic file formats for line-art and photographic images.


Twain Driver
Industry Standard driver in the SLC836C scanner which allows users to use most off the shelf software packages as compatible with the scanner.


Vector file
Consists of mathematically defined elements, such as "Line from A to B". "Circle with center and radius", etc.


Vectorization
Also called raster to vector conversion. The process of automatically converting a raster (bit-mapped) image into a vector (CAD) drawing.

 
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