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Changing the Canvas Size in Adobe Photoshop CS5

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In this excerpt from Photoshop CS5 for Windows and Macintosh: Visual QuickStart Guide, Elaine Weinmann and Peter Lourekas show you how to change the canvas size by using the Canvas Size command.
From the book

By using the Canvas Size command, you can enlarge or shrink a document’s live, editable area. Pixels can be added to or removed from one, two, three, or all four sides of the image. This is useful, say, if you want to make room for type, as in the example shown on this page, or to accommodate imagery from other documents (see Chapter 14).

To change the canvas size

  1. Choose Image > Canvas Size (Ctrl-Alt-C/Cmd-Option-C). The Canvas Size dialog opens.
  2. Optional: Choose a different unit of measure from the Width menu.
  3. Do either of the following:
  4. Optional: The gray square in the center of the Anchor arrows represents the existing image area. Click an arrow to reposition the image relative to the canvas. The arrows point to where the new canvas area will be added.
  5. From the Canvas Extension Color menu, choose a color for the added pixels. Or to choose a custom color, choose Other or click the color square next to the menu, then click a color in the Color Picker (see page 186) or in the document window. If the image doesn’t have a Background (take a peek at the Layers panel), this menu won’t be available.
  6. Click OK.C Any added canvas area will automatically be filled with the color you chose in the preceding step, unless the image contains layers but not a Background, in which case the added canvas area will be transparent.
    • You can also enlarge the canvas area manually by dragging with the Crop tool (see page 129).
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