<a href="//commons.wikimedia.org/wiki/File:Clock_Tower_from_Su_Song%27s_Book.JPG" title="File:Clock Tower from Su Song's Book.JPG">File:Clock_Tower_from_Su_Song's_Book.JPG</a> with smear removed by mixing channels:
<ul><li>Red: 0.2 green + blue</li>
<li>Green: 0.4 green + 0.65 blue</li>
<li>Blue: blue</li></ul>
as red is badly smeared, green is slightly smeared but has least noise, and blue is not smeared but has most noise.
Su Song
2007-08-15 11:36:05
<a href="//commons.wikimedia.org/wiki/File:Clock_Tower_from_Su_Song%27s_Book.JPG" title="File:Clock Tower from Su Song's Book.JPG">File:Clock_Tower_from_Su_Song's_Book.JPG</a>