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How Computers Represent ImagesThe PPM File Format(http://cs.anu.edu.au/Student/comp1100.2006.s1/asst2008-04-29 来自：SUNNY  [收藏到我的网摘]

Computers represent images by a grid of tiny coloured dots, called pixels. (The word "pixel" is an abbreviation of "picture element".) The pixels are so small that, when displayed on a computer screen, they appear to merge into a smooth image.So PPMs have the advantage that it‘s easy to work with the pixel data (you can read it and it‘s easy to extract from the file) but they take up a lot of space. So when you are writing programs that manipulate PPMs, use small images to te

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