Adobe Photoshop CS4 Manual de usuario descargar pdf (Pagina 336)

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USING PHOTOSHOP CS4

Layers

Last updated 1/10/2010

Apply or delete a layer mask

You can apply a layer mask to permanently delete the hidden portions of a layer. Layer masks are stored as alpha

channels, so applying and deleting layer masks can help reduce file size. You can also delete a layer mask without

applying the changes.

1 In the Layers panel, select the layer containing the layer mask.

2 In the Masks panel, click the Pixel Mask button.

3 Do one of the following:

• To remove the layer mask after applying it permanently to the layer, click the Apply Mask icon at the bottom

of the Masks panel.

• To remove the layer mask without applying it to the layer, click the Delete button at the bottom of the Masks panel,

and then click Delete.

You can also apply or delete layer masks using the Layer menu.

Note: You cannot apply a layer mask permanently to a Smart Object layer when deleting the layer mask.

Load a layer or layer mask’s boundaries as a selection

You can select all the non-transparent areas on a layer, or, if a layer mask exists, all the unmasked areas. This is useful

when you want to select text or image content that is surrounded by or contains transparent areas, or to create a

selection that excludes masked areas on a layer.

1 Do one of the following:

• To select only the non-transparent areas on an unmasked layer, Ctrl-click (Windows) or Command-click (Mac OS)

the layer thumbnail in the Layers panel.

• To select the unmasked areas on a layer that has a layer mask, Ctrl-click (Windows) or Command-click (Mac OS)

the layer mask thumbnail in the Layers panel.

2 If a selection already exists, you can do any of the following:

• To add the pixels to an existing selection, press Ctrl+Shift (Windows) or Command+Shift (Mac OS), and click the

layer thumbnail or layer mask thumbnail in the Layers panel.

• To subtract the pixels from an existing selection, press Ctrl+Alt (Windows) or Command+Option (Mac OS), and

click the layer thumbnail or layer mask thumbnail in the Layers panel.

• To load the intersection of the pixels and an existing selection, press Ctrl+Alt+Shift (Windows) or

Command+Option+Shift (Mac

OS), and click the layer thumbnail or layer mask thumbnail in the Layers panel.

If you want to move all the contents of a layer, use the Move tool without loading a transparency mask.

Mask layers with clipping masks

A clipping mask lets you use the content of a layer to mask the layers above it. The masking is determined by the content

of the bottom or base layer. The non-transparent content of the base layer clips (reveals), the content of the layers

above it in the clipping mask. All other content in the clipped layers is masked out.

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