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| | The World of Color. Around the Color Wheel - webreference.com |
 | | The wheel slider selects the hue component, and the triangle inside (in other programs, it is a rectangle more often than a triangle) visualizes the two other dimensions for the chosen hue: its value, or brightness (vertically), and saturation (horizontally). |
 | | Although colors changing across the rainbow are the visible effect of monotonously increasing light wavelength, the color wheel continuum is all but monotonous. |
 | | Some colors are definitely perceived as independent and standalone (red, green, blue), others need more elaboration to localize (cyan, magenta, yellow), and all the rest are clearly perceived as mixtures or transitions of neighboring colors. |
| www.webreference.com /dlab/9704/wheel.html (1596 words) |
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