Ignore:
Timestamp:
Nov 11, 2007, 10:16:17 PM (13 years ago)
Author:
Sam Hocevar
Message:
  • Sierra dithering.
  • Atkinson dithering.
File:
1 edited

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  • www/study/index.html

    r1937 r1938  
    360360</p>
    361361
     362<p> <b>Sierra dithering</b> is a variation of Stucki that is slightly faster
     363because it propagates to fewer pixels: </p>
     364
     365<p style="text-align: center;">
     366  <img src="fig3-2-5.png" width="200" height="160"
     367       style="margin-right: 30px;" alt="Sierra" />
     368  <img src="out3-2-5.png" width="256" height="256"
     369       class="inline" alt="Sierra error diffusion" />
     370  <img src="grad3-2-5.png" width="32" height="256"
     371       class="inline" alt="Sierra error diffusion gradient" />
     372</p>
     373
     374<p> <b>Atkinson dithering</b> only propagates 75% of the error, leading to a
     375loss of contrast around black and white areas, but better contrast in the
     376midtones: </p>
     377
     378<p style="text-align: center;">
     379  <img src="fig3-2-6.png" width="160" height="160"
     380       style="margin-right: 30px;" alt="Atkinson" />
     381  <img src="out3-2-6.png" width="256" height="256"
     382       class="inline" alt="Atkinson error diffusion" />
     383  <img src="grad3-2-6.png" width="32" height="256"
     384       class="inline" alt="Atkinson error diffusion gradient" />
     385</p>
     386
    362387<!--
    363388<p> There are countless other error diffusion techniques. However it appears
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