Adobe Photoshop CS Design Professional SELECTIONS ENHANCING SPECIFIC

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

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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

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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

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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

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Snapshot Commands: History Palette

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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

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Sample Picture Package

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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

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Chapter I TasksUse the Image Wand Tool to select objects

Create and use snapshots

Use the Picture Package feature to create multiple-image layouts