ch1 Flashcards
Bit-map image
system that uses pixels to make up an image.
Pixel
smallest picture element that makes up an image.
Colour depth
number of bits used to represent the
colours in a pixel
bit depth
number of bits used to represent the
smallest unit in, for example, a sound or image file –
the larger the bit depth, the better the quality of the
sound or colour image.
Image resolution
number of pixels that make up an image
Vector graphics
images that use 2D points to describe lines and curves and their properties that are grouped to form geometric shapes.
sampling
measuring the amplitude of a sound wave at a set time interval
sampling resolution
number of bits used to represent each sample ( sound amplitude)
sampling rate
the number of of samples taken per unit time
similarity between ASCII code and unicode characters
1- both can use 8 bits
2-both represent each character using a unique code
3- ASCII code is a subset of unicode
difference between ascii and unicode
1- ascii can only use up to 8-bits per character while unicode uses up to 32-bits
2- unicode represents a wider range of characters than ascii
3- unicode represents most languages while ascii only represents english character
file header
data about bitmap image
what does a file header store
1-file compression method
2- coulor depth
3-file size
4-loction of image data within the file
character set
list of characters that are defined by the computer’s software and hardware. it consists of unique codes used to define a certain character
Recorded sound editing software features
1- fade in fade out
2- add or delete part of record
3- change amplitude or frequency of the sound
4- edit duration
