>> I am trying find a method to output a resonable image which would look 
>> like the one in
>> http://en.wikipedia.org/wiki/List_of_monochrome_and_RGB_palettes#3-bit_RGB
>>     
>
> Map each layer to 0 if it's below 128, and 255 otherwise.
>
>      from PIL import Image
>
>      im = Image.open("sample.jpg")
>
>      out = im.point(lambda x: x >= 128 and 255)
>      out = out.convert("P") # optional
>
>      ...
>   

Thank you Fredrik, it worked great.
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