When you create custom layer styles, you can use contours to control the shape of Drop Shadow, Inner Shadow, Inner Glow, Outer Glow, Bevel and Emboss, and Satin effects over a given range. For example, a Linear contour on a Drop Shadow causes the opacity to drop off in a linear transition. Use a Custom contour to create a unique shadow transition.
You can select, reset, delete, or change the preview of contours in the Contour pop‑up palette and Preset Manager.

Create a custom contour
Load a contour
Click
the contour in the Layer Style dialog box, and in the Contour Editor
dialog box, and then choose Load. Go to the folder containing the
contour library you want to load and click Open.
Delete a contour
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