Thay đổi kích cỡ canvas Bằng cách sử dụng lệnh Canvas Size, bạn có thể phóng to hoặc thu nhỏ sống của một tài liệu, diện tích có thể chỉnh sửa. Điểm ảnh có thể được thêm vào hoặc gỡ bỏ từ một, hai, ba, hoặc tất cả bốn mặt của hình ảnh. | 126 Chapter 7 Changing the canvas size 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 Enter new Width and or Height values. The dimensions are independent of one another changing one won t affect the other. A B Check Relative then in the Width and Height fields enter positive values to increase those dimensions or negative values to decrease them. 4. Optional The gray square in the center of the Anchor arrows represents the existing image area. Click an arrow to reposition the image rel ative 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. 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 . To add canvas area to the top of the image in the Canvas Size dialog we increased the Height value then clicked the bottom Anchor arrow to move the gray square downward. C After adding pixels to the top of the canvas we created some editable type. Pixel Basics 127 Cropping an .
