How do you add a layer mask filter in Photoshop?

You add a layer mask in Photoshop by using the "Add Layer Mask" button located at the bottom of the Layers panel.

Steps to Add a Layer Mask Filter

Here's a breakdown of how to add a layer mask, as referenced:

1. Select the Layer: First, in the Layers panel, click on the specific layer to which you wish to apply the mask.
2. Click the Add Layer Mask Button: Navigate to the bottom of the Layers panel. You'll find the "Add Layer Mask" button, it typically looks like a rectangle with a circle in it. Click this button.
3. Observe the Mask: You will now notice a white thumbnail linked to the selected layer in the Layers panel. This is the newly created layer mask.
4. Manipulate the Mask: To work with the mask, make sure that the white mask thumbnail is selected within the Layers panel (it will have a white outline around it). Then, you can use tools like the Brush tool to modify the mask.

Working with Layer Masks

• Black and White: When using a brush on a layer mask:
  • Painting with black will conceal or hide areas of the layer.
  • Painting with white will reveal the layer.
  • Shades of gray will create partial transparency.
• Flexibility: Layer masks are non-destructive. You can edit or change them as often as needed.
• Precise Control: This masking method provides pixel-level accuracy for blending and editing.

Example

Imagine you have a photograph of a person and a background image. You want to seamlessly blend them together. With a layer mask, you can do this by:

1. Placing the person's photo on one layer and the background on another.
2. Adding a layer mask to the person's photo layer.
3. Using a brush, painting around the person with black to reveal the background.
4. Fine-tuning the mask with grays to create softer edges for a natural transition.