Sketcher is a user-friendly version of my <a href="?section=Lab&subsection=Artificial Sketching">original sketcher experiment</a> from 2005. It lets you load an image, tweak the filter and sketch settings, and save the "sketchy" version as another image.
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The sketch rendering was originally done in OpenGL, but I went and re-implemented it in software for this version for various reasons. It is a C# port of my original C++ code, and unfortunately it seems to be a good deal slower. It's still quite usable, though, provided your image isn't gigantic.
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A few features remain grayed out as well, having not been completely ported, such as Underpaint mode and the Quality setting. Underpaint is kept off, and Quality is fixed at 100%.

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<a target="_blank" href="pages/Programming/Applications/Sketcher/images/sketcher_finer.png"><img src="pages/Programming/Applications/Sketcher/images/sketcher_finer_small.png" style="vertical-align:middle; margin: 0.5em;" border="0"/></a>        
<a target="_blank" href="pages/Programming/Applications/Sketcher/images/sketcher_outdoors.png"><img src="pages/Programming/Applications/Sketcher/images/sketcher_outdoors_small.png" style="vertical-align:middle; margin: 0.5em;" border="0"/></a>        
<a target="_blank" href="pages/Programming/Applications/Sketcher/images/sketcher_gui8.png"><img src="pages/Programming/Applications/Sketcher/images/sketcher_gui8_small.png" style="vertical-align:middle; margin: 0.5em;" border="0"/></a>        
<a target="_blank" href="pages/Programming/Applications/Sketcher/images/sketcher_gui7.png"><img src="pages/Programming/Applications/Sketcher/images/sketcher_gui7_small.png" style="vertical-align:middle; margin: 0.5em;" border="0"/></a><br/>
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<a href="aux/bin/Sketcher.zip"><img src="download.png" style="border:0; vertical-align:middle; margin-right: 0.5em;"/>Download Sketcher <span style="font-size:0.7em;">(for Windows)</span></a>