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DjVu (pronounced "déjà vu") a set of compression technologies, a file format, and a software platform for the delivery over the Web of digital documents, scanned documents, and high resolution images.
Typical DjVu file sizes are as follows:
- bitonal scanned documents: 5 to 30KB per page at 300dpi (3 to 10 times smaller than PDF or TIFF)
- color scanned documents: 30 to 100KB per page at 300dpi (5 to 10 times smaller than JPEG).
- photos: 2 times smaller than JPEG, about the same as JPEG-2000, but the decoder/renderer is progressive and has minimal memory requirements.
- palettized images: 2 times smaller than GIF (up to 10 times if it's mostly text).
- digital (non scanned) documents: between 1 and 3 times smaller than PDF or gzipped PS (depending on the amount of pictures), but rendering, page flipping, zooming, panning are incomparably faster, and the image quality on screen desplays is much better (antialiased text, etc).
Bom, então como trabalhar com este novo formato? Temos de descarregar um visualizador (viewer) , no sítio da LizardTech. Se estivermos a usar o Internet Explorer podemos descarregar o ficheiro e realizar uma instalação automática (Download Option 1), se usarmos outro browser, então temos de descarregar o ficheiro e realizar a instalação no nosso computador, como qualquer outro programa (Download Option 2). Depois de instalado poderemos ver os ficheiros DJVU através de um programa similar ao Adobe Acrobat Reader.
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