Lesson 8 Flashcards
How can pictures be represented
By storing the colour of each pixel in order
What does the A stand for in RGBA
Alpha
How are RGB and RGBA different
RGB uses 3 colour channels, whereas RGBA uses 4
What is metadata
Data stored at the start of a file, the computer uses metadata to understand the rest of the file
What are some examples of metadata
Picture dimensions, colour depth, compression data
What are the two ways graphic files can be stored
Raster graphics or vector graphics
What are raster graphics
They store the colour of each pixel
What are vector graphics
They store a set of mathematical instructions for a computer to draw the graphic
What is data compression
A technique used to reduce space required to represent the same information
What are the two types of data compression
Lossless and lossy
What is lossless compression
Allows the original information to be perfectly reconstructed
What is lossy compression
It removes some of the original data