The following lines were added (+) and removed (-):
This file format was originally called the "Joint Photographic Experts Group File Interchange Format", or short, JFIF. A JPEG bitstream is a sequence of data chunks, each chunk starts with a marker value. For compression JPG mostly utilizes Baseline DCT / Huffman, providing lossy compression. The image is a continous tone photo with five or more bits per channel. This file format was originally called the "Joint Photographic Experts Group File Interchange Format", or short, JFIF. JPEG is a universal format meaning files can be opened and viewed in almost all image viewing applications. JPEG has existed for a long time and is a widely adopted format. A JPEG bitstream is a sequence of data chunks, each chunk starts with a marker value. For compression JPG mostly utilizes Baseline DCT / Huffman, providing lossy compression. The image is a continuous tone photo with five or more bits per channel. When decoded, the image appears from top to bottom like a windowshade rolling down. Compression is variable and governed by a number of parameters with typical settings providing from 10:1 to 20:1 reductions in file size. The JPEG image format is ideal for producing highly compressed, true color images for the web. Web designers attempt to achieve small file sizes for the images used in web design to accommodate visitors with limited bandwidth (such as dialup and DSL users.) The small file size doesn't come without a price. Image quality is lost when saving as a JPEG (.jpg) and the higher the compression level selected, the more image quality is lost. Furthermore, each time the JPEG image is reopened and resaved, even more image quality is lost. Because of this JPEG is not suited for images that will be frequently modified, since detail is lost each time the image is saved. JPEG files cannot have transparent backgrounds. The JPEG format is limited to 8-bits for color data, yielding 16.7 million colors. Although the human eye is not capable of discerning depths beyond this limitation, some modern digital cameras use 10-bit and higher color capture.