Correcting Perspective

Thisdocument iscreatedwithtrial versionofCHM2PDF Pilot2.16.100vith images that need a minor amount of correction. Figure 2.64 shows an image taken with an ultra-wide-angle lens tilted way back to include the top of the building. It exhibits the typical "falling backwards" look that perspective distortion produces. We can partially compensate for the distortion and improve this photo.

Figure 2.64. This image has way too much distortion for a complete fix, but we can improve its lines.

Figure 2.64. This image has way too much distortion for a complete fix, but we can improve its lines.

You can use taylorhall.jpg from the website, or work with your own photo.

1. Choose Filters > Distort > Lens Correction to produce the dialog box.

2. To make the grid a little easier to view, change the spacing to 64, and click the Color box and change to a bright magenta color, as you can see in Figure 2.65.

Figure 2.65. Straighten out the vertical lines to more closely align with the grid.

[View full size image]

Figure 2.65. Straighten out the vertical lines to more closely align with the grid.

[View full size image]

3. Click the Straighten Tool (or press A to activate it) and drag along the lower edge of the railing at the base of the columns. This tells the tool that you want to rotate the image so this line becomes horizontal.

4. Move the Vertical Perspective slider to the left (roughly to the 43 point) so that the center column is vertical.

5. Move the Horizontal Perspective slider to the left (again, about to the 43 position), providing some side-to-

6. Click OK when finished. The perspective correction won't be perfect (try one of the other methods described earlier in this chapter if you're fussy), but, with a little cropping to remove the transparent areas of the image, this drastically distorted image will look a little more normal.

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