DjVu was initially developed by AT&T and is used as an image compression technology that is an open sourced alternative to PDF. It allows for scanned documents, photographs and very high resolution images to be distributed via the internet. There are a whole host of DjVu viewers, browser plugins, encoders and decoders available on both Mac and Windows.
DjVu was initially developed by Yann LeCun, L�on Bottou, Patrick Haffner, and Paul G. Howard at AT&T Labs from 1996 to 2001. It promises smaller files sizes than standard PDF's and is therefore perceived to be superior to PDF's primarily due to it's higher compression ratio. DjVu files are typically seperated into three images - the background and foreground (around 100 dpi) and the mask image which is higher resolution (e.g. 300 dpi). The background and foreground images are compressed using an algorithm named IW44 with the mask image compressed using JB2. Ultimately this results in dramatically reduced file sizes.
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Tiff was originally created by a company called Aldus, and is now owned by Adobe systems, it is a file format for storing images, including line art and photographs. It was created due to the popularity of scanners and was thought-up to become the standard scanned image file format. It is a popular format for high-colour-depth images and it has also been adapted to accommodate greyscale images.
A TIFF file is made up of many different blocks which define the palette data or the LZW-compressed body among other things. The byte order is either Motorola or Intel depending on the first word. if it is MM, then you have Motorola byte ordering and likewise if it is II it means you have Intel byte ordering. Each TIFF file begins with an image file header which then points to an image file directory which contains the image data and image information.
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