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Find Visual Elements Common to Both Images

To find visual elements that are common to both images, you might want to change the section of the image displayed in the detail view or zoom in on a part of the image to view it in more detail. The following sections describe the different ways to change your view of the images:

Using Scroll Bars to View Other Parts of an Image

To view parts of an image that are not visible in the Detail or Overview windows, use the scroll bars provided for each window.

As you scroll the image in the Detail window, note how the Detail rectangle moves over the image in the Overview window. The position of the Detail rectangle always shows the portion of the image in the Detail window.

Using the Detail Rectangle to Change the View

To get a closer view of any part of the image, move the Detail rectangle in the Overview window over that section of the image. cpselect displays that section of the image in the Detail window at a higher magnification than the Overview window.

To move the detail rectangle,

  1. Move the pointer into the Detail rectangle. The cursor changes to the fleur shape, .

  2. Press and hold the mouse button to drag the detail rectangle anywhere on the image.

    Note   As you move the Detail rectangle over the image in the Overview window, the view of the image displayed in the Detail window changes.

Panning the Image Displayed in the Detail Window

To change the section of the image displayed in the Detail window, use the pan tool to move the image in the window.

To use the pan tool,

  1. Click the Pan button in the Control Point Selection Tool toolbar or select Pan from the Tools menu.

  2. Move the pointer over the image in the Detail window. The cursor changes to the hand shape, .

  3. Press and hold the mouse button. The cursor changes to a closed fist shape, . Use the mouse to move the image in the Detail window.

    Note   As you move the image in the Detail window, the Detail rectangle in the Overview window moves.

Zooming In and Out on an Image

To enlarge an image to get a closer look or shrink an image to see the whole image in context, you can zoom in or zoom out on the images displayed. (You can also zoom in or out on an image by changing the magnification. See Specifying the Magnification of the Images for more information.)

To zoom in or zoom out on the fixed or moving images,

  1. Click the appropriate magnifying glass button on the Control Point Selection Tool toolbar or select Zoom In or Zoom Out from the Tools menu.

  2. Move the pointer over the image in the Detail window that you want to zoom in or out on. The cursor changes to the appropriate magnifying glass shape, such as . Position the cursor over a location in the image and click the mouse. With each click, cpselect changes the magnification of the image by a preset amount. (SeeSpecifying the Magnification of the Images for a list of some of these magnifications.) cpselect centers the new view of the image on the spot where you clicked.

    Another way to use the Zoom tool to zoom in on an image is to position the cursor over a location in the image and, while pressing and holding the mouse button, draw a rectangle defining the area you want to zoom in on. cpselect magnifies the image so that the chosen section fills the Detail window. cpselect resizes the detail rectangle in the Overview window as well.

    The size of the Detail rectangle in the Overview window changes as you zoom in or out on the image in the Detail window.

    To keep the relative magnifications of the fixed and moving images synchronized as you zoom in or out, click the Lock ratio check box. See Locking the Relative Magnification of the Moving and Fixed Images for more information.

Specifying the Magnification of the Images

To enlarge an image to get a closer look or to shrink an image to see the whole image in context, use the magnification edit box. (You can also use the Zoom buttons to enlarge or shrink an image. See Zooming In and Out on an Image for more information.)

To change the magnification of an image,

  1. Move the cursor into the magnification edit box of the window you want to change. The cursor changes to the text entry cursor.

  2. Type a new value in the magnification edit box and press Enter, or click the menu associated with the edit box and choose from a list of preset magnifications. cpselect changes the magnification of the image and displays the new view in the appropriate window. To keep the relative magnifications of the fixed and moving images synchronized as you change the magnification, click the Lock ratio check box. See Locking the Relative Magnification of the Moving and Fixed Images for more information.

Locking the Relative Magnification of the Moving and Fixed Images

To keep the relative magnification of the moving and fixed images automatically synchronized in the Detail windows, click the Lock Ratio check box.

When the Lock Ratio check box is selected, cpselect changes the magnification of both the moving and fixed images when you zoom in or out on either one of the images or specify a magnification value for either of the images.

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