How to read a raw image using PIL?

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The specific documentation is at http://effbot.org/imagingbook/concepts.htm:

Mode

The mode of an image defines the type
and depth of a pixel in the image. The
current release supports the following
standard modes:

  • 1 (1-bit pixels, black and white, stored with one pixel per byte)
  • L (8-bit pixels, black and white)
  • P (8-bit pixels, mapped to any other mode using a colour palette)
  • RGB (3×8-bit pixels, true colour)
  • RGBA (4×8-bit pixels, true colour with transparency mask)
  • CMYK (4×8-bit pixels, colour separation)
  • YCbCr (3×8-bit pixels, colour video format)
  • I (32-bit signed integer pixels)
  • F (32-bit floating point pixels)

PIL also provides limited support for
a few special modes, including LA (L
with alpha), RGBX (true colour with
padding) and RGBa (true colour with
premultiplied alpha).

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