Data Representation Flashcards
(28 cards)
Are bitmaps made up of?
Pixels
What are the most common types of bitmap images?
JPEG and PNG
What are pixels?
Pixels a small coloured squares within a picture that are laid out in a structured grid.
What is pixelation?
Pixelation is when pictures are zoomed in to far and the individual pixels become viewable.
How are the colours of an image stored?
Each colour is stored as a binary value.
What is colour depth?
Colour depth is it the amount of colours and available to be used when viewing a picture. For example if a picture has a colour that 16 bits they are able to display 65,536 colours. And if a picture have a colour depth of one bet they’re able to display two colours
What are vectors?
A vector image uses straight lines calves coordinates and geometry to create an image.
Which type of image is more officiant at storing large areas of the same colour?
Vectors because they do not need to store each individual pixel.
Do you vectors lose quality when zoomed in?
No as they are not made up of pixels.
What are vector is used in?
CAD, auto shapes, animated movies, windows meta file.
What is resolution
Resolution describes how big are the pixels are in the image.
What is resolution measured in?
Pixels per inch.
What is meta data?
Meta data is data at the beginning of the file to tell the computer how to process the data.
Information is included in the meta data?
The size of the image grid, the colour depth, the resolution to display the image.
What are the two types of file compression?
Lossy and lossless.
What is file compression for?
To reduce the size of the file.
What is Lossless compression?
A type of file compression that doesn’t reduce the image quality it stores the data in a more efficient way.
What is Lossy compression?
A type of file compression that loses image quality when compressed.
What is sound?
Vibrations in the air.
How do microphones work?
They measure air pressure.
What is the sound converted to from a microphone?
Analogue to digital.
What 3 factors affect audio quality?
Sample Rate
Bit Rate
Bit Depth
What is Sample Rate?
The number of samples per second.
What is Bit Depth?
The number of bits there are. The more bits there are, the better the audio quality.
