Equations, Vocabs And Compression Flashcards
What is the sample resolution
Amount of memory allocated per sample
What is the sample rate
The number of sound samples taken per second
What is colour depth
Number of bits needed to represent each possible colour
What is the image resolution
Number of pixels that make up an image
How do you find image file size
Image resolution (number of pixels) multiplied by the colour depth
What is lossy compression
When you compress a file using lossy compression you lose part of it
- gets rid of unnecessary data
- image - reduces colour depth
- audio - reduces sample rate and resolution
- video - both
What is lossless compression
If you compress something using lossless compression you lose nothing. It is reversible
- in text you use RLE (run length encoding)
What is RLE
RLE is run length coding it is used to shorten/compress images and pictures using the ASCII code
What is the dimension of an image
Number of pixels horizontally multiplied by the number of pixels vertically
What is a pixel
A dot or square on a screen which displays colour , it consists of 3 colours, red, blue, and green. All other colour are made from these three colours
How do you find colour depth
Colour depth = file size divided by image resolution
What is an analog sound
A continuous sound
What is a digital sound
It is a discrete sound
What unit is sample resolution and pixels
Bits
What is ASCII code and what is Unicode
ASCII code is all the keyboard characters represented in a computer using a 7-bit , the Unicode is the ASCII code’s extension meaning rather than only one language the Unicode can do multiple
