Photoshop levels tools / hue - saturation implementation

edited September 2015 in How To...

Hi everyone, I would like to implement the levels and hue saturation tool from photoshop : Sans titre-3

Unfortunately, I don't know the math behind this tools. Do you have any leads wich could help me? My goal is to turn a picture like this : unnamed

Into this : toto

Thanks for you help!

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