Unsharp Mask

The Unsharp Mask effect increases the contrast between colors that define an edge.

Unsharp Mask Straight.jpg
Original Image

Radius: The distance from the edge at which pixels are adjusted for contrast. If you specify a low value, only pixels near the edge are adjusted.

unsharp-mask-a50-r5-t0
Amount: 50, Radius: 5, Threshold: 0
unsharp-mask-a50-r10-t0
Amount: 50, Radius: 10, Threshold: 0
unsharp-mask-a50-r100-t0
Amount: 50, Radius: 100, Threshold: 0

Threshold: The greatest difference between adjacent pixels for which contrast isn’t adjusted. A lower value produces a greater result. A value that is too low causes contrast for the entire image to be adjusted and can generate noise or cause unexpected results.

unsharp-mask-a100-r100-t0
Amount: 100, Radius: 100, Threshold: 0
unsharp-mask-a100-r100-t100
Amount: 100, Radius: 100, Threshold: 100

Helpful Video (http://provideocoalition.com/index.php/cmg_keyframes/story/luma_processing/)

From the Adobe Help Page (https://helpx.adobe.com/after-effects/using/blur-sharpen-effects.html#unsharp_mask_effect)

Image from http://www.unsplash.com

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