Lesson 8 Flashcards

1
Q

How can pictures be represented

A

By storing the colour of each pixel in order

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2
Q

What does the A stand for in RGBA

A

Alpha

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3
Q

How are RGB and RGBA different

A

RGB uses 3 colour channels, whereas RGBA uses 4

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4
Q

What is metadata

A

Data stored at the start of a file, the computer uses metadata to understand the rest of the file

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5
Q

What are some examples of metadata

A

Picture dimensions, colour depth, compression data

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6
Q

What are the two ways graphic files can be stored

A

Raster graphics or vector graphics

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7
Q

What are raster graphics

A

They store the colour of each pixel

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8
Q

What are vector graphics

A

They store a set of mathematical instructions for a computer to draw the graphic

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9
Q

What is data compression

A

A technique used to reduce space required to represent the same information

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10
Q

What are the two types of data compression

A

Lossless and lossy

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11
Q

What is lossless compression

A

Allows the original information to be perfectly reconstructed

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12
Q

What is lossy compression

A

It removes some of the original data

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