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ashasabeer
Posts: 55
Posted 11:27 Apr 08, 2011 |

Option3:
Convert a 24-bit color image into a gray-scale image first.
Then quantize the gray scale value into one of two values, 0, 85, 170 or 255 using the error diffusion method.

Is it one of the two values or one of the four values?

kknaur
Posts: 540
Posted 11:38 Apr 08, 2011 |

I am fairly certain it should read "Then quantize the gray scale value into one of four values, 0, 85, 175, 255 using the error diffusion method."


This is how I interpreted it and it is after all called Quad-level which implies four values to choose from.  I hope this helps ^_^.

ashasabeer
Posts: 55
Posted 11:41 Apr 08, 2011 |

Thanks for confiming.