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This lesson demonstrates two ways of straightening horizons.
Undo and Navigation Steps
Two ways of undoing steps are from the top menu, Edit then Step Backwards. Alternatively, click a previous snapshot in the History Palette.
Navigate (zoom in and pan) your image using the Navigator Palette,
or the Zoom Tool. 
Activate The Hand Tool by tapping the Spacebar, keeping the Spacebar pressed, pan your image in the usual way. 
1/
Open a suitable image onto Photoshop’s workspace, then expand it by dragging the
right-top corner diagonally upwards.
 
2/
From the top menu, choose Filter then choose Distort then choose Lens Correction. To straighten images, you are looking to alter both the Horizontal Perspective and Angle settings, as highlighted. These settings need to be altered in extremely small increments. Type in the numbers, increasing them incrementally, (1, 2, 3 etc.). This prevents the horizon from correcting too severely.
You will notice from my image below, that although the horizon has been corrected, there are transparent areas around the edges of the photograph. This is normal and cannot be avoided.
When you are satisfied with the horizon, click OK to complete the change.
3/
Now, from the toolbar activate the Crop Tool.
And carefully drag out a marquee. Your aim is to include as much of the image as possible inside the crop marquee - leaving out all of the transparent areas - similar to my demonstration below.
Keep reapplying the crop marquee, until it is correctly positioned. When you are happy with its position, from the options palette, click the Commit current crop operation tick.
You have successfully straightened your image using the Lens Correction filter.
4/
An alternative way to straighten images is this. Open your image onto the workspace, then in the Layers palette, double-click the background layer to unlock it - reply OK to the New Layer dialogue box.
5/
Now from the top menu choose Edit then choose Free Transform. A transformation box will surround your image, now, hover your cursor over the right-side, outside of the photograph, and when you see the curved double headed arrow, highlighted below, you are able to swivel your image to a straight horizontal position.
When it is straight, click the following tick. 
6/
Crop away the transparent areas around your image - exactly as described in Chapter 3 of this lesson. Both steps effect the same result, therefore, it is a personal choice which straightening tool you use.
Wendi E M Scarth. Top of Page - Home.
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