Digital cameras may have advanced greatly over the last few years, but the
underlying fallibilities of photographic positioning are still as relevant as ever,
and even the most professional photographer cannot keep their viewfinder
perfectly level all the time. There is, however, no need to despair - Photoshop
is loaded with tools that can help correct skewed horizons in mere moments.
This tutorial describes probably the simplest and most effective method for skew
correction, using the often forgotten Measure Tool.
Open up a stock image in Photoshop of any size and/or format. The best
results for this tutorial usually involve large images with a definitive
horizon or absolutely straight edge (such as the brickwork of a building, if
you wish to correct the skew in an image of a building, etc).
Note: Please remember that this method is only as effective as the
underlying image. If you have a source that's skewed in three
dimensions, this two dimensional technique may not yield the exact results
that you desire.
2: Select the Measure Tool from the tools palette. If you are
having trouble finding it, its underneath the EyeDropper Tool.
Using the Measure Tool, draw a line along the horizon by clicking, dragging,
and then releasing your mouse button. If you don't get your line correct the
first time you can just draw another one and it will replace the former
line. Try to include as much of the horizon as you can - this
will average out small inconsistencies due to waves, objects on the skyline,
3: To perform the rotation, simply select Image > Rotate Canvas >
Arbitrary from the main menu. The Measure Tool will have already
entered in the correct angle of rotation for us. Just make sure that
the direction of rotation is set correctly (i.e. either clockwise or
counter-clockwise), and press OK to rotate your image.
4: Now that you have the results of your rotation, complete with
corrected horizon, all you need to do is knock out the black areas with the
Crop Tool, a skilfully-used border, or even the Clone Stamp Tool.
- Tutorial written by Man1c M0g
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