adobe photoshop - How can I automatically find the opposite

I'd like to be able to automate the process of finding a color's opposite saturation or brightness level in Photoshop. (eg. opposite of 93% saturation is 7% saturation; opposite of 48% brightness i

Does anyone know how to convert an image to a circle - I'm trying to get these 2 points to connect on their opposite ends to form a ring - would love

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