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Compression (Types of Compression (Run Length Encoder (RLE) (Finds…
Compression
Lossy and Lossless
Lossy
When Lossy compression is used it removes data, after the data is removed its irretrievable so the original file can't be brought back.
Lossy compression algorithms analyse the image and figure out which of the rows of pixels look most similar so it can just store the first block of pixels then repeat this on the rows it deems fit.
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Lossless
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It does this by specifying the colour code for the first pixel in a block and then how many times it repeats the same pixel
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Types of Compression
Run Length Encoder (RLE)
Finds sequences where data is repeated, and instead of saving each individual it saves one code and how many times it should repeat. This is a form of lossless compression
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Perpetual Coding
Removes sections of audio that are beyond the human range of hearing. This is a form of lossy compression
Intraframe Compression
Compresses each individual frame into, typically, a lossless JPEG file
Interframe Compression
Does not store all frames, instead only saving key frames and comparing any changes to them