User:C.Suthorn/h

Optimization of Huffman table

Graphics files contain a Huffman table. In most cases this is a generic table that will work for any image content. The table can be optimized for one specific image to become a perfect match for this image only. This reduces the file size by about 30% while keeping the full image quality. At commons larger thumb files are possible with an optimitzed Huffman table.

All my new uploads of images come with an individual optimized Huffman table. Old files get updated one by one.