To expand a selection marquee from the center:  If no selec- tion exists, press Ctrl and drag the Marquee or Oval Marquee tool (on Mac, press Ctrl after you begin dragging). You can press Ctrl+Shift to constrain the selection marquee and expand it from the center. To select single rows or columns 1 Select the Row Selection tool or the Column Selection tool. If the paint object isn’t in edit mode, click it. 2 Click a single pixel to select all pixels in the same row or column in the image. A dashed border outlines the selected row or column. Or, press and hold the mouse button to see a selection outline, and move the pointer to position the selection outline. Release the mouse button to set the selection, and a dashed border outlines the selected row or column. When working in high-resolution images, you can zoom to 400% magnification or higher to see the pixels you want to select. To select areas with the Lasso tools 1 Select either Lasso tool. If the paint object isn’t in edit mode, click it. 2 Drag in the image to outline a selection. Canvas connects the starting and ending points with a straight line. A dashed border out- lines the selected areas. Lasso options To set options before using the Lasso tools, double-click either Lasso tool icon. In the dialog box, choose from the following options and click OK. Feather Radius To soften the edge of selections made with the Lasso tool, enter the feather range in pixels in the Feather Radius box. Anti-Aliased To slightly soften the edge of selection made with the Lasso tool, select the Anti-Aliased checkbox. Omit Background Color To keep pixels that match the current background color from being selected by the Lasso tool, select the Omit Background Color checkbox. This option can help you isolate an image that is surrounded by a solid color background. Use the Color Dropper tool to pick up the background color before you use the Lasso tool to make the selection. Lasso tools
Canvas 8 Help: Selections and channels (3 of 32)                                                    Page #653