The greatest drawback to XBM images is that they’re monochromatic-in other words, black-and-white, though Netscape renders them as black-and-gray. But this is also something of an advantage to us because they can be represented internally as a string of bits, one per pixel, on or off.
This also makes manipulating them fairly straightforward and not too costly in terms of processor cycles-an important consideration when working with an interpreted language, such as JavaScript. Also important to us, the XBM file’s native format is ASCII text, which can be represented using JavaScript strings.
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