Progressive JPEG additionally reorders the compressed data. Baseline JPEG, while decoding, draws line after line until all the image is shown. In next turn, another layer of data is added over previous one and quality is improved. In the end we have full quality image drawn on screen. Progressive JPEG is used in web publishing and designs.
Internet connections are often slow and messy.
Using progressive technique user can make out the image before it s fully downloaded, and thus save time, nerves and money. Almost all JPEG images found on web are progressive. Transparent JPEG Contrary to GIF format, JPEG transparency is a big problem. That would be just fine, but JPEG doesn t use constant colour values. While compressing, cell value is combined with values of surrounding cells and rounded to nearest integer.