General Stuff Flashcards
8-bit colour depth
256 colours
Colour Depth
the amount of red, green and blue in each pixel
Bit Depth
the number of bits available per clip
Bit Rate
the number of bits used per second in audio
Bitmap Image
a type of raster image that is composed of many pixels of different colours and it is possible to edit each individual pixel
Raster Graphics
dot matrix data structures that represent a grid of pixels and cannot scale up without loss of quality, often use large amounts of memory to store
Vector Graphics
allow the graphic to resize without loss of quality, unlike raster and bitmap, as these use geometrically primitive objects such as points, lines, curves, shapes and polygons which are based on mathematical expressions to display images
Metadata
data about data, eg key properties used to display an image correctly, such as height, width, colour depth
Overflow
the result of an addition or shift process if the number it results in is too large to be stored in the avaliable space
Pixels
Picture Elements
small coloured dots that make up graphics
Sampling Rate
the number of samples taken per second from the analogue input to create a digital signal, the higher the sample rate the larger the file size
Sampling Resolution
the number of bits used to store each sample, the larger the number of bits, the larger the file size
Binary Digits
either a 0 or 1
Bit
one binary digit, either 0 or 1
Nybble
4 bits
B
Byte
8 bits
Kb
Kilobyte
1024 bits
MB
Megabyte
1024 KB
GB
Gigabyte
1024 MB
TB
Terabyte
1024TB
PB
Petabyte
1024PB
EB
Exabyte
1024EB
ZB
Zettabyte
1024ZB
YB
Yottabyte
1024YB
a single keystroke or number from 1 to 255
1B
one line of text
70B
a third of a page of text
1KB
a short e-mail
1KB
a school logo
8KB
a basic webpage
30KB
maximum size of all elements for a webpage
100KB
a five-page word document
500KB
a PDF for downloading
500KB
one minute of audio stored as MP3
1MB
DVD film
5MB
HD film
10MB
Blu-ray film
25MB
Maximum amount of data on one CD-ROM
500MB
