This document describes jcolrgb version 1998.09.30.
Copyright and contact information is available in the jstools documentation.
Invoking jcolrgb causes a panel to appear that lets the user select a colour by RGB value using three sliders. A patch of the current colour is displayed. When the user clicks OK, the current colour is written to standard output. A label displaying prompt will be at the top of the panel, and it's windowmanager title will be title.
Both prompt and title are localisable.
For more details, see the documentation for j:prompt_colour_rgb in the jprompts.tcl library.