Implemented filters:
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Image negative
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Gaussian blur
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Grayscale
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Edge Detection
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Toon shading
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Pixelate
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Brightness
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Contrast(key 'c')
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Night Vision(key 'n')
For the index_custom.html: Sea wave
http://cghuyue.blogspot.com/2012/11/image-processing-vertex-shading.html