© 2011 Delmar, Cengage Learning Chapter 8 Working with Special Layer Functions
Chapter Lessons• Use a layer mask with a selection• Work with multiple masked layers• Control pixels to blend colors• Eliminate a layer mask• Use an adjustment layer• Create a clipping mask
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• Use special layer features to modify an entire image or an entire layer
• Define the precise area to manipulate in each layer
• Adjust the appearance of each layer without altering the original image (non-destructive changes)
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Using Special Layer Features
• Turn changes on or off• Align images• Blend and adjust color• Combine elements to enhance an
image
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Layer Functions
• Layer masks can cover an entire layer or specific areas within a layer
• Masks are flexible: – Hide their effect when viewing the
image or change the masks
• Add an unlimited number of masks to an image:– One mask per layer
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Understanding Layer Masks
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• Use tools on the Tools panel to create the area to mask
• Apply the mask to the selection or to everything except the selection
• Feather the edges of the selection, if required
Creating a Layer Mask
• The term Mask comes from printing:– A mask was opaque
material or tape used to block off an area of the artwork that would not be printed
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MASK
Definition of Mask
• Add a layer mask to a layer
• Reshape the layer mask with the Brush tool and a specific brush size or tip
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Painting a Layer Mask
• If the image is painted with a black foreground, the size of the mask increases:– Each brush stroke hides pixels on the
image layer– Paint with black to hide pixels
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Painting with Black Foreground
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Layer mask thumbnail
Layer mask is black to hide
pixels
School Bus layer
Layer Mask Examples
• If the image is painted with white as the foreground, the size of the mask decreases:– Each brush stroke restores pixels of the
layer object– Paint with white to reveal pixels
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Painting with White Foreground
• Create and control a mask nondestructively
• Found in the Essentials and Color and Tone workspaces
• Grouped with the Adjustments panel
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Using the Masks Panel
• Switch the foreground and background colors and paint over the mistake
• The Layer mask thumbnail on the Layers panel updates itself to reflect changes made to the mask
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Correcting a Mask
• The layer mask is a powerful editing tool:– Allows repeated editing of an image
without ever disturbing the original pixels that make up the image
• By default, the mask is linked to the layer:– When the layer is moved, the mask
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Work with Multiple Masked Layers
• The Link icon appears when a layer mask is created
• When creating a layer mask, the link icon appears between the layer thumbnail and the layer mask thumbnail
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Understanding the Link Icon
• Group or link layers to make multiple layers into one layer
• To link layers, the layer (not the layer mask) must be active – Link the active layer to other layers,
even those in different layer groups– Link entire layer groups to a single
layer or to other layer groups
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Selecting Multiple Layers
• Select multiple layers– Note that Link
layers button is not dimmed
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Link layers button
Selecting Multiple Layers
• After selecting multiple layers, perform actions that affect the group; for example:– Moving the content of selected
layers as a single unit
• Unlink layers by deselecting some/all of the selected layers
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Using Multiple Selection Layers
• To align multiple layers:– Select the layers on the Layers
panel– Select one of the six options from
the Align Linked command on the Layer menu
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Aligning Multiple Layers
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Centers of the Bananas, Floating strawberries, and
Blueberries layers are aligned
Aligned Layers
• To distribute means to evenly space content
• Distributing procedure:– Select three or more layers– Verify opacity settings are 50% or
greater– Select one of the six options from
the Distribute command on the Layer menu
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Distributing Selected Layers
• Use 1 of 10 transform commands on the Edit menu to transform an object
• Choose a transforming command:– A transform box appears around the object
to be transformed– A transform box (or bounding box) is a
rectangle that surrounds an image and contains handles used to change dimensions
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Transforming Objects
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Bounding Box with selection handles
surrounds object to be transformed
Transform Box
• Select the object
• Choose a transform command or a sequence of transform commands
• Apply changes by clicking the Commit transform button on the Options bar
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Transforming Sequence
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Strawberries scaled
Strawberries flipped
Before AfterTransforming Examples
• Alter pixels with intelligent scaling
• Make selection, click Edit > Content-Aware Scale
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Content-Aware Scaling
• Control the colors and form of an image by blending pixels on one layer with pixels on another layer
• Blending options are located in the Layer Style dialog box
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Blending Pixels
• Control how pixels are blended by choosing a color as the Blend If color– The Blend If color determines the
color range for the pixels to blend
• Use the This Layer and Underlying Layer sliders
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Control Blending
• This Layer sliders– Specify the range of pixels that will be
blended on the active layer
• Underlying Layer sliders– Specify the range of pixels that will be
blended on all the lower—but still visible—layers
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Sliders
• Create interesting effects by duplicating layers:– Click the layer to duplicate– Click the Layers panel options
button– Click Duplicate Layer, then click OK
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Using Duplicate Layers
• Disable a layer mask to:– Create duplicate layers and layer masks– Apply different styles and affects to layer
masks– Show and hide layer masks individually
to find the mask that gives the desired look
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Disable a Layer Mask
• Options for removing layer masks:– Apply the mask to the layer so that it
becomes a permanent part of the layer– Discard the mask and its effect
completely
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Removing Layer Masks
• A special layer that acts as a color filter for a single layer or all the layers beneath
• Create an adjustment layer to adjust color and tone
• Color changes made to the adjustment layer exist only in the adjustment layer, leaving the original layer unchanged
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Use an Adjustment Layer
• Select the layer to adjust
• Use the Layer menu to click the new adjustments layer command or by clicking the Create new fill or adjustment layer button on the Layers panel
• Specify which of the color adjustments is required
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Creating an Adjustment Layer
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Creative/advanced controls
Tonal controls
Color controls
Adjustments Panel
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New Adjustment Layer added to the
Layers panel
Sample Adjustment Layer
• Levels• Curves• Color Balance• Brightness/
Contrast• Hue/Saturation
• Selective Color• Channel Mixer• Gradient Map• Invert• Threshold• Posterize
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Color Adjustments
• Modify an adjustment layer by double-clicking the layer thumbnail on the adjustment layer
• Use as many adjustment layers as required, but create each one individually
• Merge adjustment layers with any visible layers in the image, including multiple-selection layers
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Working with Adjustment Layers
• Group of two or more contiguous layers
• Used when one layer is to act as the mask for other layers or if the adjustment layer is to affect only the layer directly beneath it
• Bottom layer of a clipping mask is called the base layer and serves as the mask
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Create a Clipping Mask
• Two layers are required: – One to create the shape of the mask – One to supply the content for the mask
• Either a type or an image layer can be used to create the clipping mask shape
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Creating a Clipping Mask