Painter and teacher Richard Robinson has created a free interactive tool that lets you experiment with gamut masks. 
With the digital interface, you can choose from a set of pre-shaped gamuts and move them around on either a traditional or a Yurmby wheel. Or you can draw your own gamut shape. The sliders let you shift the value or neutralize the chroma of the wheel in increments.
Once you find a gamut or a range of colors that you like, you can mix color strings and paint from them. The gamut-mapping method will be part of my new book on color and light coming out in the fall.
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Richard Robinson's Digital Gamut Masking Tool.
Previously on Gurney Journey: From Mask to Palette, 2008, The Yurmby Wheel, Color and Light Book.
