PHP Dynamic Image Map Based on Pixel Colour

So today I created a html image map which creates dynamic links based on the color of the pixel that the user clicked. The reason for creating this was because the map was a vector map of the world and as you know all countries have varying sizes and it would be impossible to create a normal point/array based image map… it would simple be too huge to store and would take too long to load.
Pro’s of this method

* It loads really fast
* No need to know what areas of the image are covered by what for links
* Image areas can be any shape or size

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