Perfect Architecture Shots - 6/16/08elptSeven simple steps for correcting vertical convergence
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By William Sawalich
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Some photographers spend a lot of their time keeping things straight: horizon lines, roofs and walls, interior decor
No matter how straight the line started, leave it to the camera to make it crooked. One of the best ways to deal with these off-kilter angles is to correct for them in the computer.
A common example of crooked lines that should be straight is in an architectural photograph. Even if youre not an architectural pro, sometimes the goofy convergence that shows up in shots doesnt do a scene justice. When this optical distortion strikes, try these few simple steps to correct for that vertical convergenceand then apply the same principles to fix all sorts of other distortions in your pictures.
STEP 1: If you are able to work with layers, create a duplicate of your shot on a new one. This will make it easier to monitor progressor even revert to the prefixed version should the need arise. If you cant work in layers, simply save your shot as a new document to avoid accidentally overwriting the original file. Then get to work.
STEP 2: Enlarge the canvas, making it bigger than the original shot.
Without an expanded canvas, its easy to lose valuable picture
information outside the edges. For a 4x6 photo, consider adding a
couple of inches on each side. You can always crop it back to normal in
a later step.
STEP 3: View guides and grid lines if possible, because they act as
ideal reference points for whats actually straight and vertical.
Remember that you dont always have to make the lines perfectly
vertical or parallel to get a pleasing effect. Sometimes just
minimizing the distortion is enough to improve the shot significantly,
without further compromising the integrity of the scene.
STEP 4: Stretch the top of the image from the center to the edges to
correct a structure that bends toward the middlealmost as if you were
widening a shot of train tracks as they converge toward the horizon. In
Photoshop, choose Edit > Transform > Perspective. Grab the image in a
box at the top corners, and as you pull one corner out, youll see the
opposite corner move as well. If you need to correct one side of the
image without the other, simply use the Edit > Transform > Distort
tool. This tweak is a great way to adjust off-center vertical subjects.
STEP 5: Youve now pulled the top edges of the frame outside the
original boundaries, effectively changing the proportions and making
the shot look squished. To return the shot to an accurate proportion,
use the Transform > Scale tool to lift the top of the image (from the
center) until the building no longer seems squat.
STEP 6: Now choose the crop tool and drag the selection to cover as
much of the image as possible, without including any empty canvas. The
top corners should look almost like wings outside of the cropping box.
If those areas contain essential image informationanything you dont
want to losego back and readjust the correction to leave more original
but make less perspective change.
STEP 7: Finally, merge the layers into one and save the file (with a new
name if you didnt do that way back at the beginning). Before
flattening, dont forget to take advantage of those layers and toggle
between the old and new versions, marveling at your technical ability
and remarkable talent for accurate architecture photography!
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