Lossy

<aside> 💡 When a file is made smaller but some information is lost in the process

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• Used on images for websites, especially when they are a small size, as a small amount of lost information (quality) does not make much of a difference, yet speeds up the load time of the page

Lossless

<aside> 💡 When a file is made smaller but no information is lost

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Run length encoding

• When a character is repeated multiple times, it can be used in images which repeat a certain pixel colour

Huffman encoding

• Example of dictionary encoding
• Gives letters that appear more frequently shorter codes and longer codes to those that appear less often, which results in a smaller compressed file

Comparing compression

<aside> 💡 Compression ratio = uncompressed size / compressed size

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