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Chapter Lessons

OVERVIEW. Chapter Lessons. 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. INTRODUCTION.

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Chapter Lessons

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  1. OVERVIEW Chapter Lessons • 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 Working with Layers

  2. INTRODUCTION Using Channels • 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 Working with Layers

  3. INTRODUCTION Fixing Imperfections • 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 Working with Layers

  4. INTRODUCTION 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 Working with Layers

  5. INTRODUCTION Advantages of Snapshots • Name 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 Working with Layers

  6. INTRODUCTION 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 Working with Layers

  7. LESSON 1 Create an Alpha ChannelDefining 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) Working with Layers

  8. LESSON 1 More on Channels • An 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 Working with Layers

  9. LESSON 1 Alpha and Spot Channels • Alpha 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 Working with Layers

  10. LESSON 1 Understanding Alpha Channels • Create on the Channels palette • Can create an alpha channel that masks all or specific areas of a layer • Use alpha channels to: • Preserve a selection to experiment with • Use later • Create special effects • Save and reuse in other images Working with Layers

  11. LESSON 1 Saving an Alpha Channel • Use the following formats to save an alpha channel: • PSD • PDF • PICT • TIFF • Raw Alpha channels do not print Working with Layers

  12. LESSON 1 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 Working with Layers

  13. LESSON 1 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 Working with Layers

  14. LESSON 1 Channels Palette Working with Layers

  15. LESSON 1 Channel Properties • Hide channels • Re-order channels • View channels as thumbnails on the Channels palette Working with Layers

  16. LESSON 1 Creating an Alpha Channel • Select a portion of an image • Click the Save selection as channel button on the Channels palette • Double-click the Alpha 1 thumbnail on the Channels palette • Click the color box in the Channel Options dialog box • Set the color and select options Working with Layers

  17. LESSON 1 Alpha Layer Example Before Red alpha channel overlaying blue produced purple After Working with Layers

  18. LESSON 2 Use Extract to Isolate an ObjectIsolating Objects • Use the Extract feature to isolate a foreground object from its background • After extracting an image, modify the extracted object layer as required Working with Layers

  19. LESSON 2 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 Working with Layers

  20. LESSON 2 Extraction Tools Working with Layers

  21. 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 LESSON 3 Erase Areas in an Image to Enhance AppearanceErasing Areas Working with Layers

  22. LESSON 3 Eraser Tool Examples Eraser tool exposes background color Magic Eraser erases similarly colored pixels Background Eraser exposes transparency of the layer below Working with Layers

  23. LESSON 4 Fix Imperfections in an ImageTouching 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 Working with Layers

  24. LESSON 4 Using the Clone Stamp Tool Object to delete Sampled area applied to hide portions of the object Working with Layers

  25. LESSON 5 Use the Magic Wand Tool to Select ObjectsUsing 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 Working with Layers

  26. LESSON 5 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 Working with Layers

  27. LESSON 5 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 Working with Layers

  28. LESSON 6 Learn How to Create SnapshotsUnderstanding 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 Working with Layers

  29. LESSON 6 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 Working with Layers

  30. LESSON 6 Snapshot Commands: History Palette Working with Layers

  31. LESSON 7 Create Multiple-Image LayoutsUnderstanding a Picture Package • Generate 20 types of multiple-image layouts • A picture package can contain multiple sizes of a single image Working with Layers

  32. LESSON 7 Sample Picture Package Working with Layers

  33. LESSON 7 Assembling a Contact Sheet • Assemble a maximum of 30 thumbnail images in a folder Working with Layers

  34. SUMMARY Chapter I Tasks • Define channels and create an alpha channel • Use the Extract feature to isolate objects • Use Eraser tools • Use the Clone Stamp Tool to fix errors Working with Layers

  35. SUMMARY Chapter I Tasks • Use the Image Wand Tool to select objects • Create and use snapshots • Use the Picture Package feature to create multiple-image layouts Working with Layers

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