More info here
Web based color picker using a modified version of a javascript color picker created by John Dyer. It uses the Mongoose embedded web server, AngularJS for the other ui elements and a combination of rsx plugin and script nodes to communicate with trueSpace. It works with Firefox and Chrome web browsers. Internet Explorer(IE) does not work as well and older versions of IE won't work at all. Colors update in real time and it has 8 slots for color swatches. The swatches can also be loaded from the image based node color picker.
installation instructions here: webui.html - installs both the scene view and color picker
Note that the video below was made for an old version of the color picker and does not show the installation of the second rsx plugin and does not mention the persistent script requirement.
The Color Picker node can be used to sample a color from an image and save it to the swatch list