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translating negative values to positive

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Rob Hindleytranslating negative values to positive
by on Mar 25, 2008 at 11:58:51 pm

I am trying to create an expression slider which when increased simultaneously blows out the luminance values while desaturating the video. I've easily attached the glow parameter but when using Hue & Saturation the desaturation value is in the opposite direction (negative value)

what expression do I need so the value works when the slider moves up in positive values?

Gribble
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