Le format JPEG utilise donc 3 compressions :

• Chrominance Subsampling
• Discrete Cosine Transform & Quantization
• Run-Length, Delta & Huffman Encoding

C'est tellement bien pensé :)
Je le relirais plus tard afin de bien tout comprendre.

Pour la culture :

The smallest I could think of was four bytes: three to specify the color and one to specify how many pixels have this color. The idea of expressing all repeated values concisely this way is called run-length encoding.
Delta-encoding is the technique of storing each byte as a relative value compared to something before it instead of storing its absolute value.