To apply an adjustment to a layer mask, you typically use an adjustment layer which comes with its own layer mask. This allows you to selectively apply the adjustment to specific areas of an image.
How to Apply an Adjustment Layer with a Mask
Here's a step-by-step guide on how to use an adjustment layer with its mask:
- Select the target layer: Choose the layer in your image that you want to adjust.
- Add an Adjustment Layer:
- Locate the "Create new fill or adjustment layer" button at the bottom of the Layers panel. This button is often represented by a circle icon that is half-filled.
- Click on the button. A pop-up menu with various adjustment options will appear.
- Choose the type of Adjustment: In the pop-up menu, select the specific adjustment you want to apply. For example, you might choose "Hue/Saturation", "Curves", "Levels," or "Brightness/Contrast".
- Adjustment Layer Created: Upon selection, an adjustment layer will appear above the selected layer within the Layers panel. The adjustment layer comes with a layer mask, which is initially filled with white.
Understanding the Layer Mask
- White Layer Mask: When the layer mask is white, the entire adjustment effect is visible on the layer(s) below.
- Black Layer Mask: If the layer mask is black, the adjustment will have no effect.
- Grey shades: Using a shades of grey will allow the adjustment to partially appear on the layer.
Practical Insight: You can use brush tools to paint on a mask with black or white to hide or reveal parts of the adjustment. If you have a black mask and you need to show the adjustment, use white. If the mask is white, using black will hide the adjustment.
Example: Using Hue/Saturation Adjustment
- To apply a Hue/Saturation adjustment to a particular area of an image, you could choose a Hue/Saturation adjustment layer.
- By default, the whole layer mask is white, and hence the Hue/Saturation adjustment is visible over the whole layer below.
- You can then use a brush with black colour and paint over the layer mask to hide the adjustment in those areas.
- Conversely, if you painted in black and need to bring back the adjustments, select white colour and paint.
Table: Layer Mask Interaction with Adjustment Layers
| Layer Mask Color | Adjustment Effect |
|---|---|
| White | Adjustment Fully Applied |
| Black | Adjustment Hidden |
| Shades of Grey | Adjustment Partially Applied |
