image mode

stlaw

参见
http://effbot.org/imagingbook/concepts.htm#mode
另：
本地保留查询页面
http://www.pythonware.com/library/pil/handbook/
http://effbot.org/zone/pil-index.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 (3x8-bit pixels, true colour)
  
• 
  RGBA (4x8-bit pixels, true colour with transparency
  mask)
  
• 
  CMYK (4x8-bit pixels, colour separation)
  
• 
  YCbCr (3x8-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).
However, PIL doesn’t support user-defined modes; if you to handle band
combinations that are not listed above, use a sequence of Image
objects.
You can read the mode of an image through the
mode
attribute. This
is a string containing one of the above values.
               
               
               

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