pixpic: Render images in the browser using color DIV tags

This class can render images in the browser using color DIV tags.

It can open a given image file and render it as HTML div tags of 1 pixel of size with background color set to the respective pixel in the image.

The image may be scale with a given zoom level by increasing the size of the DIV tags.

The class can also extract the palette of colors used in the image into an array.

Detect edge of foot area in image
Process image of foot of diabetic patient