Image, sound and compression 0.0 / 5 ? ICTSystems and SoftwareGCSEOCR Created by: ivan.chongCreated on: 19-09-17 14:56 What is a pixel? A pixel is the smallest element of an image. 1 of 11 What is colour depth? Colour depth is the number of bits used to represent the colour of one pixel. 2 of 11 What is image size? Image size is the width and height of the image in pixels. 3 of 11 What is image metadata? Metadata is data stored within an image. 4 of 11 What are some examples of metadata? Examples include: creator of image, date of creation, time and date the image was last changed. 5 of 11 What is a character set? A defined list of acharacters recognised by the computer hardware and software 6 of 11 What is the resolution of an image? The resolution is the number of pixels in an image. 7 of 11 What types of compression are there? Lossy and lossless 8 of 11 How does lossy compression work? Lossy compression removes some information from the image permanently to 9 of 11 How does lossless compression work? Lossless compression shrinks the whole image down and can be restored to its original state later. 10 of 11 How can sound be sampled and be converted to digital format? Frequency is represented by bits and at certain intervals a sample of the bits are taken which can be later used to form a digital signal. 11 of 11
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