Image compression


GIF’s (Patented format – Patent expired in 2000)

– Supported animated GIF’s too


PNG (Patent Free)

– 8 Bit color scheme + Rich true color pallette + Alpha transparency

– Delta Encoding – Represent pixels as delta of neighbour. 000000020000, and then compress 0’s. Represent all adjacent 0’s by say A



– 8*8 pixel boxes.


– Quantization – neighbours are rounded and therefore Lossy data compression

  • Baseline – Data writte blocks after blocks. Therefore rendering also from baseline (say top left to right and down)
  • Progressive – Random blocks are written. Read also in same manner, like FB(mobile) does – something is visible, even if hazy initially,


WebP – Supported by Google

JPGxR – Supported by Microsoft.



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