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A bitmap graphic may be referred to as a raster graphic. When viewed at 100%, each dot corresponds to an individual pixel on a display. A file with the .bmp extension is an uncompressed bitmap. Other raster graphic types, known as compressed bitmaps, include JPEG, GIF, and PNG. A bitmap is not a vector graphic. If a bitmap image is enlarged it will always look blocky because each dot will take up more than one pixel.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.Baseline JPEG compression is the most common and is nearly synonymous with the use of the term JPEG. 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.''Note that although Baseline JPEG lossy compression is what is widely used there are other more obscure implementations including a lossless JPEG ([[JPEG lossless coding mode]]). It should also be noted that when using baseline JPEG compression, setting the quality to 100% in software when saving an image still results in image quality loss. It is not implied that such a setting would switch to a lossless coding mode.''=== Many Graphic File Formats ===Including proprietary types, there are hundreds of image file types. Some of the formats that are most often used for purposes including web pages, email, digital photography, and desktop publishing are discussed on this page.