5.3 Vector and Bitmapped Images 0.0 / 5 ? ComputingData representationASAll boards Created by: EmilyCreated on: 30-05-14 13:36 What are the components of a bitmapped graphic? (what are they made up of?) Pixels 1 of 26 What are the components of a vector graphic? (what are they made up of?) Objects 2 of 26 What is a pixel? The smallest accessible area and smallest solid block of colour in an image 3 of 26 What is an object? A component of a vector graphic, describing size, direction, thickness, shading etc. 4 of 26 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. 5 of 26 What is resolution measured in? Pixels 6 of 26 How is image resolution expressed? In number of pixels per cm/inch 7 of 26 How is VDU screen resolution expressed? In number of pixels per row and per column 8 of 26 How do you create a higher resolution image of the same size as the original? Create a bitmap of MORE PIXELS 9 of 26 The higher the resolution of an image... ...the smaller the pixels 10 of 26 Name the two types of compression Lossy, and Run-length encoding 11 of 26 Describe lossy compression The file is compressed so that the 'unimportant' information is reduced/discarded 12 of 26 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 13 of 26 What is colour depth? The number of bits that represent a pixel's colour 14 of 26 What is 1-bit colour? Black and white 15 of 26 What is 12-bit colour? Direct colour- 4 bits per RGB component 16 of 26 What is True colour? 8 bits per RGB 17 of 26 What is 32-bit colour? True colour with an extra 8 bits 18 of 26 White is made when RGB = 100% 19 of 26 Black is made when RGB = 0% 20 of 26 Bitmapped images are good for... Photographs 21 of 26 Vector graphics are good for... Logos 22 of 26 Bitmapped images are better because they use less memory as PHOTOS 23 of 26 Vector graphics are better because they use less memory regardless, and can be used at any size 24 of 26 Bitmapped images are bad because They can't be used at any size, often when blown up they look pixelated 25 of 26 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) 26 of 26
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