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16 Cards in this Set
- Front
- Back
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What is Metadata?
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Metadata is the data that allows the computer to recreate the image.
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What does Metadata contain?
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Metadata contains information such as the height and width in pixels and the colour depth in bits per pixel.
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What is a pixel?
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A pixel is the smallest representable area in an image
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What is colour depth used for?
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Colour depth is the number of bits used to represent a single pixel.
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What does 1920x1080 mean?
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It means the resolution of the length and width of the screen
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What does pixel stand for?
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Pixel stands for picture element
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What is resolution written as?
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Resolution is written as the number of pixels by row by the number of pixels by column
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Why does a computer need to convert everything to binary?
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It coverts all data inputted into binary so that the computer can process and understand that data.
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What is each pixel made up of?
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Each pixel in an image is made up of binary numbers.
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What is the image quality affected by?
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Image quality is affected by the resolution of the image
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What happens in a lower resolution image?
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In a low-resolution image, the pixels are larger so fewer are needed to fill the space.
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How do we represent sound on the computer?
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Sound needs to be converted into binary for computers to be able to process it. To do this, sound is captured - usually by a microphone - and then converted into a digital signal.
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How do we increase the quality of the sound once it has been processed?
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The way to increase the quality and store the sound at a quality closer to the original, is to have more time samples that are closer together.
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Why do we compress files?
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We compress files to reduce the file size of text, image and sound data in order to transfer it more quickly and so that it takes up less storage space.
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What are the different types of compression?
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The types of compression are lossy and lossless compression.
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What is the difference between lossy and lossless compression.
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Lossy compression removes some of a file’s original data in order to reduce the file size so reduces quality whereas Lossless compression doesn’t reduce the quality of the file. No data is lost, so lossless compression allows a file to be recreated exactly as it was when originally created.
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