5.3 Vector and Bitmapped Images

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  • Created by: Emily
  • Created on: 30-05-14 13:36
What are the components of a bitmapped graphic? (what are they made up of?)
Pixels
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What are the components of a vector graphic? (what are they made up of?)
Objects
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What is a pixel?
The smallest accessible area and smallest solid block of colour in an image
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What is an object?
A component of a vector graphic, describing size, direction, thickness, shading etc.
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How are bitmapped graphics stored in memory?
Each pixel has a binary code which represents its colour. Each of these binary codes are stored in memory as a bitmapped file.
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What is resolution measured in?
Pixels
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How is image resolution expressed?
In number of pixels per cm/inch
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How is VDU screen resolution expressed?
In number of pixels per row and per column
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How do you create a higher resolution image of the same size as the original?
Create a bitmap of MORE PIXELS
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The higher the resolution of an image...
...the smaller the pixels
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Name the two types of compression
Lossy, and Run-length encoding
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Describe lossy compression
The file is compressed so that the 'unimportant' information is reduced/discarded
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Describe run-length encoding
It groups together pixels of the same colour codes and stores one binary code colour, with an extra byte saying how many pixels have this colour code
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What is colour depth?
The number of bits that represent a pixel's colour
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What is 1-bit colour?
Black and white
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What is 12-bit colour?
Direct colour- 4 bits per RGB component
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What is True colour?
8 bits per RGB
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What is 32-bit colour?
True colour with an extra 8 bits
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White is made when
RGB = 100%
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Black is made when
RGB = 0%
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Bitmapped images are good for...
Photographs
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Vector graphics are good for...
Logos
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Bitmapped images are better because
they use less memory as PHOTOS
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Vector graphics are better because
they use less memory regardless, and can be used at any size
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Bitmapped images are bad because
They can't be used at any size, often when blown up they look pixelated
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Vector graphics are bad because
They are not good for photos, and quality can still be limited by output devices (e.g. bad quality computer screen)
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Other cards in this set

Card 2

Front

What are the components of a vector graphic? (what are they made up of?)

Back

Objects

Card 3

Front

What is a pixel?

Back

Preview of the front of card 3

Card 4

Front

What is an object?

Back

Preview of the front of card 4

Card 5

Front

How are bitmapped graphics stored in memory?

Back

Preview of the front of card 5
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