by Julieanne Kost
When burning down edges in a traditional darkroom, the corners were often affected more than the sides (due to overlap). To achieve this effect in Photoshop, create a new layer and set it’s blend mode to Multiply on the Layers panel. Then, select the Gradient tool and select the “foreground to transparent” gradient from the gradient picker (in the Options bar). Select a light to medium gray as your foreground color (or select black and lower the opacity of the Gradient tool) and set the blend mode for the Gradient tool to Multiply. Position the gradient tool at the outside edge of the image and click-drag the gradient into the image as far as the burned edge is desired. Repeat for each edge.