| BMP |
Bitmap
Image: Also called raster images, bitmap files
use a grid of pixels to represent images.
Every pixel in an image is given a specific
location and color value. The number of pixels
combined make up the image data. Dependent
on resolution, bitmap images are best used
to show gradations of shades of color, such
as photographs and printed images. One thing
to note about bitmap images is that you cannot
enlarge them without changing the resolution
as well, or else the image will blur. |
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| BIOS
|
Best Input / Output
System |
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| Byte |
Usually made up of 8
bits for a microcomputer, a byte is the smallest
amount of computer memory needed to store
one character of data. |
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| CMOS |
Complementary Metal-Oxide-Silicon:
The heart of the camera. It produces a digital/analog
output representing each pixel. Its support
circuitry will normally include a Crystal
Oscillator and power supply decoupling. Some
sensors may need a resistive bias network
of some type. All of these components are
normally surface mounted on the back of the
PCB and occupy very little surface space. |
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| CCD |
Character Coupled Device:
Most commonly found in electronic scanners,
this device converts light waves into digital
information. |
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| DPI |
Dots Per Inch: A measurement
of resolution, DPI equals the number of dots
that fit horizontally and vertically into
a one-inch measurement. Typically the higher
the dpi, the more detail in an image. DPI
varies depending on the output device. A web
page resolution is almost always 72 dpi; a
printer from 300 to 1440 dpi (varyies according
to the printer). |
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| Exposure |
The amount of light
in an image. Increasing or reducing available
light can change the exposure of an image. |
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| Filter |
A tool that allows you
to apply or create special effects to an image.
Filters in your scanning software include
Blur/Blur More, Sharpen/Sharpen More, Emboss,
and Edge Enhancement. |
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| JPEG
(JPG) |
Joint Photographic Experts
Group: As a file format, JPEG can shrink files
down to about 5% of their original size. Some
amount of detail, however, is lost in the
compression. |
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| Megabyte |
A unit of computer memory
capacity equal to 1,048,576 bytes. |
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| Optical
Resolution |
The true sampling that
is being captured by the scanner's CCD; thus,
the true resolution of a scanner (as opposed
to interpolated). Optical resolution represents
the amount of detail in an image before any
software manipulation has taken place. |
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| OS |
Operation System (e.g.
Windows 98 / 2000 / XP) |
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| PDF |
Portable Document Format:
Created by Adobe Systems, this is the file
format that is most commonly used and viewed
by Adobe Acrobat, a universal browser. PDF
saves formatting information from many desktop
publishing applications so that a document
appears to the recipient as it is intended. |
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| Pixels |
A picture element, or
a single unit of a graphic image, used by
the computer to represent image information
in a digital format. An image file, for instance,
is simply a representation of hundreds (or
thousands) of pixels arranged closely together
in a grid so that they appear to form a picture. |
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| Resolution |
The level of detail
in an image, expressed in dots per inch or
dpi. The greater the dpi number, the higher
the resolution and the resulting file size. |
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| TIFF
(TIF) |
Tagged Image File Format:
The most popular file format used today, TIFF
files are good for storing bitmap images.
Since it is supported by most image-editing
software, it is recommended to use TIFF when
sharing files between firms and team members. |
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| USB |
Universal Serial Bus:
An external peripheral interface standard
that supports data transfer rates of 12 million
bits per second. |
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| VGA |
Video Graphics Adapter. |
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| ZIP |
A data compression format.
Files that have been compressed with this
format are called ZIP files and often end
with a .zip extension. |
