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Title : The hub of the color wheel
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The hub of the color wheel

Joshua asks on YouTube: "You said in part 1 of Color Wheel Masking, "... As each of these colors approaches the center, it becomes a neutral gray." Why neutral gray, what is the reasoning or significance for this? I see in some wheels, the use of (outer to inner circles) white, black and saturation centers as well as neutral gray. Same question regarding a center white or black, if you please?"

A color circle created using CMYK Sliders (Source)

Answer: You could use white or black instead of gray at the center of a color wheel, and many people do, especially when they're in the digital realm. Whichever you choose, you want the center of the wheel to sit at the hub of the wheel of hues, with zero saturation. Black, white, and gray all fit that description.

It helps to keep in mind that the color wheel is really a two-dimensional slice of a 3-D volume, where the vertical axis is a gray scale. The Munsell chart is like a tree with the trunk of the tree with the array of hues branching out from the central trunk. The trunk of that tree is a gray scale with white at the top and black at the bottom.

Note that the colors have peak saturation at different values. Yellow peaks in lighter values and blue peaks at darker values.

To flatten that color tree into a single flat pancake, you not only have to choose a central value from white to black, but you have to choose what value to make each of the hues around the perimeter.

I chose to represent the hues at the value where they appear at peak chroma and then I put the center point at an average gray value rather than raising it up to white or dropping it to black.

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More on color in my book: Color and Light: A Guide for the Realist Painter (Volume 2) (James Gurney Art)

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