There are many different reasons for and ways of encoding data, and one of these ways is Huffman coding. The idea behind Huffman coding is simply to use shorter bit patterns for more common characters, and longer bit patterns for less common characters. The Huffman optimization is a lossless process that has absolutely no effect on the resulting image quality. This compression method is useful for archival purposes and for data transmission. If this option is available, it is always best to enable JPEG optimization. ImageConverter Plus uses Huffman coding as the default compression method when the output image file is supposed to be in the JPEG format.