character sets, images, sound, compression Flashcards
1
Q
how many bits and characters are used in ASCII
A
7 bits and 128 characters
2
Q
how many bits and characters are used in extended ASCII
A
8 bits and 256 characters
3
Q
how many bits and characters are used in Unicode
A
16 bits per character and over 65,000 different characters
4
Q
what is metadata
data about data
A
the data stored in file alongside the actual file data . e.g. the type of image, the image dimensions, the colour depth
5
Q
lossy compression advantages
A
smallest file size, least transmission time, reduces internet collisions and traffic
6
Q
lossless compression advantages
A
og quality still preserved / no data is lost
