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HSL and undefined hue

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I've been playing around with some code that converts between HSL and RGB that uses -400 as the value for undefined hue, for example, with grayscale shades. This raised the question for me if there was a technical reason for that value or if it was an agreed upon convention or if the original coder just picked it because it was negative and far from 360. Can anyone shed some light on this for me? [Edited by - LessBread on October 4, 2006 3:10:47 PM]

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