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Part2 : Images and their Handling |
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Part 2 explains that traditional films are space consuming and clumsy to handle, but that images are the opposite. It explains how images are made up: arrays of pixels encode the picture.
If they are black and white images, the pixels are grey; if they are colour
images, the pixels are red, green and blue. Modern images (CT, MR) extend this idea to three dimensions - a stack of images. The pixels are now (conceptually) 3-dimensional and are called voxels, from "volume pixel". Voxelised data sets can become very big indeed. The size of these images is dictated by: |
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The number
of pixels In order to store more detail, the computer needs many pixels, but more pixels require more memory. |
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The range
of greys each pixel can take A simple black and white image is less complex than one with many subtle shades of grey or colour. |
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There are advanatges are disadavantages to adjusting each of these factors. |
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