How do I convert an HSB value (-180 +180) into 0 - 1

HI there
Im a designer and have been colour shifting some images using flashes HSB filter that uses -180 +180 values. We're designing an iphone app and apparently the HSB used by the sdk requires a figure of between 0 & 1. Does any body know a way to convert?
many thanks for your help!
Nick

(Value + 180)/360
Adding 180 makes sure the value is between 0 and 360. Dividing by 360 then scales that to the range between 0 and 1. (0/360 = 0 and 360/360 = 1)

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How do I convert an HSB value (-180 +180) into 0 - 1

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