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Layer Masks

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Delete a Layer Mask

You can delete a layer mask by clicking on it and while holding down the mouse button dropping it on the trash canDelete icon. A new window will opem with 3 options:

Apply: Apply the mask to the layer first, before removing it. Read more about this in the section "Apply Layer Mask'.

Cancel: Cancel this action

Discard: Remove the layer mask but keep the layer itself intact.

Deleteing a Layer Mask

Edit a Layer Mask in the document window

The thumbnail in the layers palette is often too small if you're making adjustments to the mask. It's however possible to edit the mask in the document window and to treat it as we would treat a normal image as long as we restrict ourselves to black, white or gray.

We can edit the mask in the document windows by holding down the Alt key while double clicking on the mask.

Editing a Layer Mask in Document Window

Right click on Layer Mask (context menu)

You can right click on a mask and a context menu will pop up.

Several options deal with a Selection. We'll talk about this later.

Earlier you've learned how to disable a mask, how to apply or discard it. You'll notice that all these 3 options are available in the context menu.

The Layer Mask Options gives you the opportunity to change the color of the opacity mask. You'll read more about that later.

Context Menu

Apply Layer Mask

You can get rid of a masks by deleting it or by applying it to the layer.

Apply Layer Mask

This is the result of applying the layer mask to the layer:

Apply Layer Mask

We can apply a layer mask to a layer by:

  • Clicking on apply when we want to delete a layer mask and getting the message "Apply mask to layer before removing?"
  • Merging the layer with its mask with the layer underneath (Ctrl + E / Command + E on the Mac).
  • Right clicking on the Layer Mask and selecting in the context menu 'Apply Layer Mask'.
  • In the menu: Layer / Remove Layer Mask / Apply

Layer Mask with gray

A layer mask doesn't need to be either black or white but it can be any gray scale image:

Layer Mask with Gray

 

It's easy to understand that white makes part of a layer visible and that black makes things invisible. Look at everything in between as changing the opacity of the layer. The opacity is the transparency of a layer.

In this example we have a gray mask and it has the same effect as changing the opacity, so the green looks lighter and that's because part of the bottom layer (white) is shining through.
If the bottom layer would have been black, then the result would have been a darker green.
You can see what kind of effect gray scale masks have by enabling/disabling them a few times (see 'Disabling a Layer Mask')..

Layer Masks and gradients

The nice thing about layer masks is that they are flexible. In this example we have used a linear Black & White gradient to fill our mask:

Layer Mask and Gradients

 

The result is an image that's green on top (white pixels in a mask don't affect the layer), white at the bottom (black makes the green pixels invisible, so you can see the white background) and everything in between is a transparent green with the white background shining through.

Layer Styles in combination with Layer Masks

You can add Layer Styles to any layer that contains a mask. The layer style will take the mask in account.

In this example the layer style wasn't affecting only the layer, but the result of the layer and its mask (a green circle):

Layer Styles in combination with Layer Masks

Vector Mask

We've seen earlier that our regular masks are always grayscale. Photoshop however also allows us to use vectors to mask a layer. These vectors are not drawn on the normal grayscale masks but on a dedicated Vector Mask.
Vector Mask

 

A Vector Mask can be created by going to the menu and selecting: Layer / Add Vector Masks / Reveal(hide) All

Now look at this example:

Vector Mask

 

If we add a shape, in this case with the Ellipse Tool with the Shape Layers icon selected in the options bar, we're actually creating a Fill Layer in combination with a Vector Mask.

There are many way to create Vector Masks and these are just two examples.

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