|
byte
|
8 bits, reflecting values between 0 to 255; used as a basic
method of measurement of memory or disk size; "K"
represents 1024 bytes
|
|
color correctness
|
the depth and accuracy of an image's color representation,
typically influenced by the color depth and palette of an
image
|
|
color depth
|
the amount of color information in an image, reflected in the # of color bits compression, lossless scheme of organizing information in a more compact form where all of the original information is retained, while gaining a moderate level of compaction
|
|
compression, lossy
|
scheme of organizing information in a more compact form
where some information is lost to gain higher levels of
compaction
|
|
cmyk
|
the four process colors -- cyan, magenta, yellow and black
-- mixed to provide a color image; typically used in printing
applications
|
|
dib
|
Device Independent Bitmap, a variant of a bitmap (bmp) file consisting of header field, an optional pallette, and bitmap data; bitmap has an additional header field
|
|
display quality
|
the characteristics of a display sub-system, such as
resolution, # of colors, dot pitch, and refresh rate, which
influence perceived image quality
|
|
dithering
|
the technique of making adjacent pixels different colors to
make them appear like a different color; utilized to add the
appearance of greater color depth with a limited # of colors
|
|
dot pitch
|
distance in millimeters between two holes in the shadow
mask of a monitor. A smaller dp is better, e.g. 0.28 mm is
better than 0.36.
|
|
dpi, dots per inch
|
sometimes termed pixels per inch, this depicts resolution and is a significant influence on the size of an image file; a higher dpi indicates higher resolution
|
|
eps
|
Encapsulated PostScript file format, an Adobe Systems
graphics file which incorporates PostScript code and can
contain data as vectors or bitmaps; maximum color depth =
16.7 million
|
|
gif
|
Graphics Interchange Format, a lossy compression
technique, popular for exchanging files electronically,
especially on Compuserve; all files have a corresponding
palette; maximum colors = 256
|
|
jpeg
|
Joint Photographers Expert Group; a compressed, lossy
format which is symmetrical, i.e. takes the same amount of
time to compress as decompress; maximum colors = 16.7
million
|
|
lpi, lines per inch
|
measurement of the frequency of "dots" represented in a
halftone image
|
|
mpeg
|
high-quality video compression/decompression scheme
(CODEC) for encoding video and audio for computer
playback
|
|
palette
|
data structure defining the colors utilized in a bitmap image;
bitmap data is indexed to the palette table
|
|
Photo CD
|
Kodak CD-based digital imaging format, where images are
typically created from 35mm film negatives or slides; includes multiple resolutions of an image in an Image Pac, with all images 24 bpp encoded in
YCC format; portability includes Philips CD-Interactive and 3DO Players, as well as PC, Mac & Unix viewers; maximum colors = 16.7 million
|
|
pcd
|
see Photo CD
|
|
pcx
|
ZSoft format, used widely for paint and desktop publishing
programs; popular for exchanging images; maximum 16.7
million colors
|
|
PICT
|
standard format for Macintosh, can contain both vector and
bitmap information; maximum colors = 16.7 million
|
|
pixel
|
picture element, or the smallest unit of the computer screen.
A pixel can be monochrome or up to the pixel depth
available on your color system. Pixels are also used for
identifying screen resolution, e.g. 72 pixels per inch.
|
|
pixels per inch, or ppi
|
sometimes termed dots per inch, this represents resolution
|
|
print quality
|
the characteristics of a printing sub-system, such as the
number of lines per inch and paper quality, which influence
the perceived quality of a printed image
|
|
quicktime
|
a video compression/decompression scheme (CODEC) for
encoding video and audio for computer playback; originally
an Apple Macintosh file format, it is now commonly utilized
on Windows and Unix systems
|
|
resolution
|
measure of the detail in an image; the higher the resolution,
the higher the amount of detail
|
|
RGB
|
red, green, blue mixed to provide a color image, typically
used in video display applications
|
|
TGA
|
Targa format developed by Truevision; usually 15 or 24 bit
full color images, compressed or uncompressed; maximum
colors = 16.7 million
|
|
tiff
|
Tag Image File Format; industry standard image file format;
"tags" represent image attributes, compression, and color
tables; both uncompressed and compressed versions,
although compressed is not as portable; maximum colors =
16.7 million
|
| vector graphics |
image made up of individual objects, which are defined as
mathematical elements with specific characteristics
|
| WMF, Microsoft Windows metafile |
DIB record, can be compressed for 4 and 8-bit images;
maximum colors = 16.7 million
|
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