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Adds punch to the Shadows whilst leaving the other portions of your image untouched. View the output of the Blur node whilst controlling H,S+L together or just the Luma portion of the HSL Key to qualify exactly what is a Shadow. Once you've qualified your Shadows, view the Output node whilst controlling the Blur node. Set to 1, you will see an obvious shadow darken, whilst a higher setting yields a subtler effect. Optional curve to control how 'dark' the selective-shadow gets.