How to Use the Adaptive Wide Angle Filter in Photoshop CS6 - dummies

How to Use the Adaptive Wide Angle Filter in Photoshop CS6

By Barbara Obermeier

The Adaptive Wide Angle filter in Photoshop CS6 uses an algorithm to correct photos shot with a large field-of-view, including full frame fisheye, wide angle rectilinear, and even spherical panoramic images. All of these use special lenses that capture wide angles of view. Although you may desire the distortion these lenses capture, you may also want to refine some of it.

For example, wide-angle rectilinear images don’t have the extreme barrel or pincushion distortion you get with a fisheye lens, but the straight lines of buildings and walls may be slightly curved. This filter attempts to correct those bent lines as well as some of the widening you can get at the edges of the image. Follow these steps to run the Adaptive Wide Angle filter on your image:

  1. Choose Filter→Adaptive Wide Angle.

    The Adaptive Wide Angle dialog box appears.

  2. Specify your available options:

    • Correction: If your camera profile is available, the filter will be listed in the bottomleft corner. If the lens profile is available, the Correction option defaults to Auto. If this isn’t the case, you may choose from Fisheye, Perspective, or Full Spherical lens types. If you choose Fisheye or Perspective, the filter tries to interpret the metadata from the photo and acquire the focal length and crop factor values.

    • Scale: Slide the slider and set your image scale from 50 to 150%.

    • Focal Length: If your camera and lens metadata are obtained by the filter, this value is automatically specified. If not, you may specify the length of your focal length (distance from the middle of the lens to the center of the sensor).

      Just a tidbit of camera info for you. The shorter the focal length, the wider the angle of view and consequently, the more you can fit into your shot. The longer the focal length, the narrower the angle of view. But on the plus side, objects in the distance appear larger in your shot.

    • Crop Factor: Again, if the camera and lens metadata are acquired by the filter, this value will be automatically specified. If not you may frame your image as desired by dragging the slider.

    • As Shot: This option is selected if the filter can obtain the camera and lens metadata. However, you may override the values from the metadata. If you want to recover the data from the metadata, select the As Shot box.

    • Constraint Tool: Use this tool to draw lines over what you want to straighten in the image. Click the tool at your desired starting point and drag to your desired end point. To edit the constraint, drag an endpoint.

    • Polygon Constraint Tool: Works similarly to the Constraint Tool, but enables you to create a polygon instead of a single line. To edit the constraint, drag an endpoint.

      Press the Ctrl (Cmd on the Mac) to add to an existing constraint. Press the Shift key to add a constraint with a horizontal or vertical orientation . Press the Alt (Option on the Mac) and click on the constraint to delete it.

    • Move, Hand, Zoom Tools: These familiar tools will help you edit your image by allowing you to move the image within the image window and navigate around the image window itself.

  3. Use the other options to help in your correction task as needed:

    • Magnification: Adjust the magnification of your preview in the lower-left corner by clicking the + and – buttons or choosing a preset magnification percentage from the drop-down menu (pop-up menu on the Mac).

    • Preview: Select and deselect the Preview option to get corrected and original views of your image.

    • Show Constraints: Show and hide your constraint lines.

    • Show Mesh: Show and hide the mesh grid.

  4. After you have your image corrected to your liking click OK to apply your corrections and exit the dialog box. If you want to start over, press the Alt (Option on the Mac) and click the Reset button.

    [Credit: © Image #5865288]
    Credit: © Image #5865288