some data files are quite large high resolution or music sampled data high frequency result in several megabytes of data.
compression- process pf reducing the number of bits required to represent data
lossless: often used where the graphic might be changed by another person or where the image contains layers of graphics that need to be kept separate from each other.
no data loss
it is high quality
lossy: offers a higher compression on rotation
run length encoding: a method of compressing data by eliminating repeated data
dictionary based: compression technique is used whem compressing text files
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