Even when we are very careful when composing
an image, we will occasionally end up with a crooked horizon line. Here
is a good way to correct this error.
1) Make sure the rulers are showing at the top and
left side. If not, hit Control R.
2) Select the Crop tool and go up to the top until the arrow replaces
the crop tool as your cursor.
3) Pull down a "grid" line by left clicking as you drag down.
Drag the grid line down until it matches either the left or right of
the horizon in the photo. This is a perfect line to use to measure the
needed adjustment. By comparing this line to the horizon in the photo,
you can see how much (if any) adjustment is needed.
4) Select the measure tool (this is under the eyedropper tool). You
can bring this out by left clicking the eyedropper tool and holding
the mouse button down while staying on the eyedropper. Another window
will open and you can select the measure tool.
5) Using the measure tool, click on the right point of the horizon in
the picture and continue to hold the mouse button down and then move
across and click on the left point of the picture’s horizon.
6) You should now have two lines: The first Grid line that shows a perfectly
horizontal line, and a line that follows the horizon in the photo. The
angle between these lines is the needed amount of adjustment.
7) Go up to and select “Image”, then select “Rotate
Canvas” and then select “Arbitrary”. The adjustment
angle should be shown in the Angle window. Just click OK and the picture
will shift to correct the horizon in the photo.
8) Now use the crop tool to re-crop the image. The horizon line in the
new photo will now be corrected.
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