1. © 2011 Delmar, Cengage Learning Chapter 10 Enhancing Specific Selections

2. Chapter Lessons Create an alpha channel Isolate an object Erase areas in an image to enhance appearance Use the Clone Stamp tool to make repairs Use the Magic Wand tool to select objects Learn how to create snapshots Create multiple-image layouts © 2011 Delmar Cengage Learning

3. 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 © 2011 Delmar Cengage Learning Using Channels

4. Isolate areas Erase areas using a variety of eraser tools Take a sample and then paint that sample over an area using the Clone Stamp tool © 2011 Delmar Cengage Learning Fixing Imperfections

5. Use the snapshot command to make a temporary copy of any state of an image The snapshot is added (above the states) at the top of the History panel © 2011 Delmar Cengage Learning Creating Snapshots

6. 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 © 2011 Delmar Cengage Learning Advantages of Snapshots

7. Create an image that contains various sizes of the same image or several different images Print images in a variety of sizes and shapes on a single sheet Create a contact sheet consisting of thumbnail images © 2011 Delmar Cengage Learning Using Automation Features

8. Created automatically in a new image Used to store color information about images Example: –A CMYK image has at least four channels (cyan, magenta, yellow, black) © 2011 Delmar Cengage Learning Create an Alpha Channel

9. 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 © 2011 Delmar Cengage Learning More on Channels

10. Alpha Channels and Spot Channels specify 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 © 2011 Delmar Cengage Learning Alpha and Spot Channels

11. Created on the Channels panel Can create an alpha channel that masks all or specific areas of a layer Use alpha channels to: –Preserve a selection for experimentation –Use later –Create special effects –Save and reuse in other images © 2011 Delmar Cengage Learning Understanding Alpha Channels

12. Use the following formats to save an alpha channel: –PSD –PDF –PICT –TIFF –Raw © 2011 Delmar Cengage Learning Alpha channels do not print Saving an Alpha Channel

13. 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 © 2011 Delmar Cengage Learning Understanding the Channels Panel

14. On the Channels panel, 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 © 2011 Delmar Cengage Learning Order of Channels

15. © 2011 Delmar Cengage Learning Channels Panel

16. Hide channels Re-order channels View channels as thumbnails on the Channels panel © 2011 Delmar Cengage Learning Channel Properties

17. Select a portion of an image Click the Save selection as channel button on the Channels panel Double-click the Alpha 1 thumbnail on the Channels panel Click the color box in the Channel Options dialog box Set the color and select options © 2011 Delmar Cengage Learning Creating an Alpha Channel

18. © 2011 Delmar Cengage Learning Before After Red alpha channel overlaying purple produced violet Alpha Layer Example

19. Use the Extract plug-in to isolate a foreground object from its background After extracting an image, modify the extracted object layer as required © 2011 Delmar Cengage Learning Isolating an Object

20. 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 © 2011 Delmar Cengage Learning Using Extract

21. © 2011 Delmar Cengage Learning Extra Plug-in Tools

22. 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 © 2011 Delmar Cengage Learning Using Erase Tools

23. © 2011 Delmar Cengage Learning Magic Eraser erases similarly colored pixels Background Eraser exposes transparency of the layer below Eraser tool exposes background color Eraser Tool Examples

24. 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 © 2011 Delmar Cengage Learning Fix Imperfections in an Image

25. © 2011 Delmar Cengage Learning Object to delete Sampled area applied to hide portions of the object Using the Clone Stamp Tool

26. Use the Magic Wand tool to choose pixels that are similar to pixels clicked in an image Specify tolerance settings Specify whether to select only contiguous pixels © 2011 Delmar Cengage Learning Using the Magic Wand Tool

27. 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 © 2011 Delmar Cengage Learning Understanding Tolerance

28. 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 © 2011 Delmar Cengage Learning Using the Eyedropper Tool

29. Create a snapshot of the image at various stages: –Before beginning an editing session –After crucial changes have been made Use the snapshot to revert to original image settings, if required © 2011 Delmar Cengage Learning Creating Snapshots

30. Click the Create new snapshot button on the History panel Each new snapshot is numbered consecutively, and can be renamed Snapshots appear in order at the top of the History panel © 2011 Delmar Cengage Learning Creating Snapshots

31. © 2011 Delmar Cengage Learning Creating Snapshots

32. Created in Adobe Bridge Generate multiple-image layouts A picture package can contain multiple sizes of a single image Can be saved as a PDF © 2011 Delmar Cengage Learning Create Multiple-Image Layouts

33. © 2011 Delmar Cengage Learning Sample Picture Package

34. Assemble a maximum of 30 thumbnail images per page within a folder © 2011 Delmar Cengage Learning Assembling a Contact Sheet