svg filter image manipulation

Manipulate the overall hue, saturation and lightness of the image using svg filters.

This was based on a very similar canvas-based version by Patrick H. Lauke.

Note that this is not an optimized version, the filter chain could be done using a single 'feColorMatrix' element if the matrix values were computed in script.

Photo: Patrick H. Lauke. Creative Commons Attribution 3.0

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