The original intent of the color mapper is as a tool for web sales and marketing people. It allows them to quickly get the colors from a client’s site and apply them to the applications they use.
This would not be a design approach, but a way to help clients see their colors on a product.
The other value of this scheme is as a design tool. Many times, the first step in design is to get the client’s existing colors into a design. This approach provides the starting point. It probably isn’t feasible to extend the concept to images.
The code listed isn’t automated, and due to previous security issues, no live demo is available. To use it, you need basic Linux command line and PHP experience.
It is likely some level of manual editing will be required, but, again, the time savings with this approach is truly tremendous.