I recently built a Http Handler for an Asp.net application that needed to generate image thumbnails from different image types on the fly. Sounds easy enough, right?
Well it was a simple task until I tried to generate a thumbnail from a gif. After hours and hours trying to figure out how to improve the resolution I found a great article addressing this particular issue.
The key to this conundrum you ask? Color quantization.
Unfortunately System.Drawing uses a web-safe palette even though just about every gif you've ever seen uses an adaptive palette.
The result:
After implementing Brendan Tompkins Octree-based quantization technique...
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