As my blog is on colour theory a though a post about its basic terms would be a good start. Value refers to the lightness or darkness of a hue in relation to white or black. As an example, yellow is a “High Key” value or is closer to white. A dark hue such as violet or blue is a “Low Key” value and is closer to black. Scales of values can be described in a chart showing several distinct gradations. The term “Brightness” is also used when referring to a value scale. Contrast of value can be useful in defining objects in space from each other while gradation of a value can suggest the contour of a surface.
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