Extracts the dominant color palettes from a set of images and outputs them as a list of hex colors.
Supports GIF, PNG and JPEG.
Uses quant to provide both median and mean quantizers.
Default palette size is 16 and capped at 256 colors. Default quatization mode is median.
##Usage
color-extract --size=16 --mode=median /path/to/file1.png /path/to/file2.png...