How do you add a shadow behind something in Photoshop?

You can add a shadow behind an object or text in Photoshop using the Drop Shadow layer style. Here's a step-by-step guide:

Steps to Add a Drop Shadow

1. Select the Layer: In the Layers panel, click on the layer containing the object or text you want to add a shadow to. This is crucial because the shadow effect will be applied to this specific layer.

2. Open Layer Style: There are two common ways to open the Layer Style window:

   • Double-Click: Double-click on the layer itself in the Layers panel (but not on the layer name or mask).
   • FX Button: Click the "fx" button (Add a layer style) at the bottom of the Layers panel and choose "Drop Shadow..." from the menu.

3. Enable Drop Shadow: In the Layer Style window that appears, check the box next to "Drop Shadow" on the left-hand menu. Clicking on the words "Drop Shadow" itself will select it and display the settings for the drop shadow on the right-hand side of the window.

4. Adjust Shadow Settings: On the right-hand side, you'll find various settings to customize your shadow. Here's a breakdown of the most important options:

   • Blend Mode: Determines how the shadow interacts with the layers beneath it. "Multiply" is a common and often effective choice.

   • Opacity: Controls the transparency of the shadow. Lower values create a more subtle shadow, while higher values create a darker, more defined shadow.

   • Angle: Sets the direction of the light source and, consequently, the direction of the shadow. You can either enter a value in degrees or click and drag within the Angle dial. Unchecking "Use Global Light" allows each layer style to have its own light source.

   • Distance: Determines how far the shadow is offset from the object. A larger distance creates a more pronounced shadow.

   • Spread: Controls the hardness or softness of the shadow's edge. A higher spread value makes the shadow more solid, while a lower value creates a softer, more feathered edge.

   • Size: Determines the blurriness of the shadow. A larger size creates a more diffused, blurred shadow, while a smaller size creates a sharper shadow.

   • Contour: Alters the falloff pattern of the shadow's opacity. This can create unique and interesting shadow effects.

   • Noise: Adds random grain to the shadow, which can be useful for creating a more textured or gritty look.

   • Layer Knocks Out Drop Shadow: This option, when unchecked (the default), allows the layer's contents to cast a shadow. If checked, the layer's contents are 'invisible' to the shadow effect, only the shadow itself is visible.

5. Preview and Adjust: As you adjust the settings, the shadow will update in real-time on your image, allowing you to see the effect of your changes. Experiment with different settings until you achieve the desired look.

6. Click OK: Once you're satisfied with the shadow, click "OK" to apply the effect.

Editing the Drop Shadow

You can easily edit the drop shadow at any time by double-clicking on "Drop Shadow" under the layer in the Layers panel. This will re-open the Layer Style window, allowing you to adjust the settings as needed. You can also hide or show the drop shadow effect by clicking the eye icon next to "Drop Shadow" in the Layers panel.