The 3 Dimensions of Color

Color has three dimensions: hue, value, and chroma.   Hue is the position on a typical color wheel where red is opposite green, blue is opposed to orange, and yellow is across from purple.   Value is the lightness or darkness and goes from white to black.  Chroma is the intensity or dullness of a color.   Everyone understands hue, but value and chroma are often confused.  Orange presents a good example of the difference.  I can make it lighter or darker just by adding more or less water to it which is a change in value.  I can make orange duller by adding its opposite hue, namely blue, which is a change in chroma. What makes orange so interesting in this context is that the addition of blue can take the orange to brown and even to black.  In other words the color that we normally think of as brown is not a different hue, it is really just a dull orange.  Similarly when we dull down a yellow we get olive which is not really a green at all.  Whodanode!  Now I need to figure out how to add pictures to my postings so that I can insert examples.  Anyone with any ideas, please leave me a comment on how to.   Thanks