Photoshop Drop Shadow Distance and Spread Settings

In Adobe Photoshop, the appearance of a drop shadow is managed through dedicated controls inside the Layer Style dialog box. Specifically, the offset of the shadow is determined by the Distance slider, while the density and expansion of the shadow's edges are controlled by the Spread slider. Understanding how these parameters function—alongside complementary settings like Size and Angle—allows you to create realistic depth and dimension for any layer element.

Accessing the Drop Shadow Parameters

To adjust these settings, open the Layer Style panel:

  1. Double-click the target layer in the Layers panel (or click the fx icon at the bottom of the panel).
  2. Select Drop Shadow from the list on the left to reveal the shadow options.
  3. Locate the Structure section, where the primary spatial controls reside.

The Distance Parameter

The Distance slider specifies the offset distance between the original object and its shadow, measured in pixels.

  • Moving the slider to a higher value pushes the shadow farther away from the subject, creating the illusion that the object is elevated higher above the background.
  • Setting the value to 0 px centers the shadow directly behind the object, creating an even, glow-like shadow around all edges (often used for hovering or backlit effects).
  • The direction of this distance is determined by the Angle wheel and whether Use Global Light is checked. You can also manually click and drag the shadow directly on the canvas while the Layer Style dialog is open to adjust the Distance and Angle simultaneously.

The Spread Parameter

The Spread slider determines how the shadow expands and hardens before the blur boundary takes effect. It is measured as a percentage (from 0% to 100%).

  • At 0%, the shadow transitions smoothly and feathers immediately based on the blur radius.
  • Increasing the percentage expands the dense, opaque core of the shadow toward the outer boundary, reducing the soft, feathered edge.
  • At 100%, the shadow loses all edge feathering and forms a hard, crisp contour identical in shape to the original object.

The Relationship Between Spread and Size

The Spread parameter works in tandem with the Size slider. While Size dictates the overall blur radius (softness) of the shadow in pixels, Spread dictates what percentage of that radius remains solid before the falloff begins. For a soft, natural shadow, keep Spread at a low percentage (0% to 15%) and increase the Size. For a dense, stylized, or blocky shadow, increase both Spread and Size.