Images and sound Flashcards
What is colour depth
The amount of bits available for colours in an image, range of colours available
How do you add more colours to an image
Adds more bits
How do you work out the image file size
Image height x image width x colour depth
What does the resolution of an image describe
How tightly packed the pixels are, e.g. more pixels is a higher resolution
How does the resolution affect the file size
A higher resolution means a large file size
What is metadata
Data about data
What does metadata include
Height and width of the image
author
resolution
colour depth
What does an analogue to digital converter do
Captures a sound wave at regular intervals
and then is converted into binary
and stored in a file for later use
What is the sample rate
The number of samples recorded in a given period of time
How does the sample rate affect the sound
A higher sample rate means the sound is closer to the original
- The higher sample rate the larger the file size
What is the bit depth
The number of bits used to record each sample
How to calculate the bit rate
Sample rate x bit depth
