A color map is a type of global resource that can be used
to vary the color of a visual project object depending on a value
associated with the object.
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For example, you might want a bar chart to display bar colors
depending on the values returned by the query. If you want the color
to change from red to black when your product shows a profit, you
can create a color map that will specify the colors to use when the
data reaches certain breakpoint values. Color maps are either discrete
or blended. Discrete color maps display a different color for each
data value. Blended color maps blend the colors. Breakpoints specify
the value at which the color changes.