Please enable JavaScript.

Coggle requires JavaScript to display documents.

SLR 9: Compression, encryption, hashing - Coggle Diagram

- - - - When used for images, it can reduce size by mentioning the pixel colour followed by the number of times it appears in a row.
      - Ideal for images with large amounts of repeating colours,
    - - Dictionary encoding: suited to text documents
        
        Each data entry in the file is recorded and assigned a unique identifier. The file now consists of the index of entries, and the series of identifiers needed to recreate the file.
      - Run-length encoding: suited for bitmap images (images made up of individual pixels)
        
        Instead of storing each pixel individually, information is stored in frequency/data pairs, which stores the colour of a pixel and the number of times it appears in a row. This means that for large areas of colour, the bit code only needs to be stored once.