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Chapter 16. Retouching > Lens Correction Filter

Lens Correction Filter

The Lens Correction filter (which is found under the Filter > Distort menu) is designed to correct for distortion that is caused by either the camera lens itself, or by the angle the lens was pointed relative to the subject of the photo.

Let's start off with a quick tour and then we'll get busy fixing some images (Figure 16.118). Since this filter is often used on subjects that contain a lot of vertical and horizontal lines (like buildings), there is a grid that can help you see when you've removed all the distortion from an image. You can toggle the grid on and off with the Show Grid checkbox, control how much space there is between grid lines with the Size setting and reposition the grid using the Move Grid tool (which looks like a hand on top of a grid). You can zoom in and scroll around your image using the Zoom and Hand tools, but I prefer to use the standard keyboard shortcuts of holding down Command (Mac) or Ctrl (Windows) and pressing the plus or minus keys and using the Spacebar to temporarily access the Hand tool. After you've experimented with some of the sliders on the right, you can toggle the Preview checkbox to see what the image looks like before and after the lens correction has been applied Now that you know your way around the dialog box, let's see what all those sliders can actually accomplish.


PREVIEW

                                                                          

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