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Adobe Photoshop CS Design Professional
SELECTIONSENHANCING SPECIFIC
2Working with Layers Chapter I
Create an alpha channel
Use Extract to isolate an object
Erase areas in an image to enhance appearance
Fix imperfections in an image
Use the Magic Wand Tool to select objects
Learn how to create snapshots
Create multiple-image layouts
Chapter Lessons
3Working with Layers Chapter I
Nearly every image opened or created in Photoshop is separated into channels
Channels are used to house the color information for each layer and layer mask in an image
Using Channels
4Working with Layers Chapter I
Isolate areas using the Extract feature
Erase areas using a variety of eraser tools
Take a sample and then paint that sample over an area using the Clone Stamp Tool
Fixing Imperfections
5Working with Layers Chapter I
Creating Snapshots
Use the snapshot command to make a temporary copy of any state of an image
The snapshot is added to the top of the History palette
6Working with Layers Chapter I
Advantages of SnapshotsName a snapshot to make it easy to identify and manage
Compare changes to images easily: take a snapshot before and after making changes
Recover work easily
7Working with Layers Chapter I
Using Automation Features Create an image that contains various sizes of the same image or several different images
Use the Picture Package feature to print images in a variety of sizes and shapes on a single sheet
Create a contact sheet consisting of thumbnail images
8Working with Layers Chapter I
Create an Alpha Channel Defining Channels
Created automatically in a new document
Used to store color information about images
Example:– A CMYK image has at least four
channels (cyan, magenta, yellow, black)
9Working with Layers Chapter I
More on ChannelsAn image can consist of from 1 to 24 color channels
Default channels are color channels contained in an image and created automatically
Add Alpha or Spot channels to images displayed in all color modes, except the bitmap modes
10Working with Layers Chapter I
Alpha and Spot ChannelsAlpha Channels and Spot Channel specific color information added to the image
Alpha channel is used to:– Create and store masks to manipulate,
isolate, or protect parts of an image
Spot channel contains:– Information about special pre-mixed inks
used in CYMK color printing
11Working with Layers Chapter I
Understanding Alpha Channels
Create on the Channels paletteCan create an alpha channel that masks all or specific areas of a layerUse alpha channels to:– Preserve a selection to experiment with– Use later– Create special effects – Save and reuse in other images
12Working with Layers Chapter I
Saving an Alpha ChannelUse the following formats to save an alpha channel:– PSD– PDF– PICT– TIFF– Raw
Alpha channels do
not print
13Working with Layers Chapter I
Understanding the Channels Palette
Lists all the default channels contained in a layer
Manages all the image’s channels
To access:– Click the Channels tab next to the
Layers tab
14Working with Layers Chapter I
Order of Channels
On the Channels palette, channels appear in the following order:– Composite channel: combination of
other default channels– Additional default channels that are
based on existing color modes– Spot color channels– Alpha channels
15Working with Layers Chapter I
Channels Palette
16Working with Layers Chapter I
Channel Properties
Hide channels
Re-order channels
View channels as thumbnails on the Channels palette
17Working with Layers Chapter I
Creating an Alpha Channel
Select a portion of an imageClick the Save selection as channel button on the Channels paletteDouble-click the Alpha 1 thumbnail on the Channels paletteClick the color box in the Channel Options dialog boxSet the color and select options
18Working with Layers Chapter I
Alpha Layer Example
Red alpha channel overlaying blue produced
purple
Before
After
19Working with Layers Chapter I
Use Extract to Isolate an Object Isolating Objects
Use the Extract feature to isolate a foreground object from its background
After extracting an image, modify the extracted object layer as required
20Working with Layers Chapter I
Using Extract
Use tools in the Extract dialog box to extract objects:– Use the Edge Highlighter Tool to
trace the edge of the object to extract– Use the Fill Tool to select everything
inside the edge
21Working with Layers Chapter I
Extraction Tools
22Working with Layers Chapter I
Erase Areas in an Image to Enhance Appearance Erasing Areas
Use Eraser tools to erase an area without going through the extraction process
Three Eraser tools are available:– Eraser Tool– Background Eraser Tool– Magic Eraser Tool
23Working with Layers Chapter I
Eraser Tool ExamplesEraser tool
exposes background color
Magic Eraser erases similarly colored pixels
Background Eraser exposes transparency
of the layer below
24Working with Layers Chapter I
Fix Imperfections in an Image Touching Up Areas
Use the Clone Stamp Tool to copy a sample in an image, then paste it over an area to cover
Size of the sample taken depends on the brush tip size selected
25Working with Layers Chapter I
Using the Clone Stamp Tool
Object to delete
Sampled area applied to hide portions of the
object
26Working with Layers Chapter I
Use the Magic Wand Tool to Select Objects Using the Magic Wand Tool
Use the Magic Wand Tool to choose pixels that are similar to pixels clicked in an image
Specific tolerance settings
Specify whether to select only contiguous pixels
27Working with Layers Chapter I
Understanding Tolerance
Tolerance setting determines the range of colors that can be selected with the Magic Wand Tool
Example:– Low tolerance: Magic Wand Tool
selects a narrow range of pixels– High tolerance: Magic Wand Tool
selects a wider range of pixels
28Working with Layers Chapter I
Using the Eyedropper Tool
Area selected by the Magic Wand Tool is related to the settings for the Eyedropper Tool
While working with the Magic Wand Tool, verify or change Eyedropper Tool settings as needed
29Working with Layers Chapter I
Learn How to Create Snapshots Understanding Snapshots
Create a snapshot of of the History palette image:– Before beginning an editing session– After crucial changes have been
made
Use the snapshot to revert to original image settings, if required
30Working with Layers Chapter I
Creating a Snapshot
Click the Create new snapshot button on the History palette
Each new snapshot is numbered consecutively
Snapshots appear in order at the top of the History palette
31Working with Layers Chapter I
Snapshot Commands: History Palette
32Working with Layers Chapter I
Create Multiple-Image Layouts Understanding a Picture Package
Generate 20 types of multiple-image layouts
A picture package can contain multiple sizes of a single image
33Working with Layers Chapter I
Sample Picture Package
34Working with Layers Chapter I
Assembling a Contact Sheet
Assemble a maximum of 30 thumbnail images in a folder
35Working with Layers Chapter I
Chapter I TasksDefine channels and create an alpha channel
Use the Extract feature to isolate objects
Use Eraser tools
Use the Clone Stamp Tool to fix errors
36Working with Layers Chapter I
Chapter I TasksUse the Image Wand Tool to select objects
Create and use snapshots
Use the Picture Package feature to create multiple-image layouts