170
S
O FAR IN THIS
chapter, we’ve been
looking at how to use and
match existing perspective to
make montages look more
realistic.
But there are times when
you simply want to get rid of
the perspective that’s already
in a photographed scene, as is
the case with the picture used
here. The Perspective Crop
tool is perfect for straightening
out skewed images: it takes
images photographed at an
angle and squares them up.
I photographed the
Japanese print on this page
in a museum in Norway.
But when I stood right in
front of it, I could see my
strong reflection in the glass.
Shooting from the side was
the only way to avoid the
reflection.
1
I had to get quite a sharp angle on the print in
order to lose my reflection. There’s still some
reflection in the upper right, but this would be
easy to clean up afterwards.
5
Cancel the Crop operation, and make a new
layer. On that layer, draw diagonals from each
corner of the frame to the opposite corner. You can
do this most easily using the Shapes tool, and in
CS6 you can change the stroke width afterwards.
2
Choose the Perspective Crop tool – it’s nested
beneath the Crop tool in the Tool panel – and
drag from corner to corner on the image, just
touching opposite corners of the frame.
6
Use the Perspective Crop tool as before,
only this time drag the midpoint marker (it’s
right in the middle, and isn’t easy to see) to the
intersection of the diagonals. Then hit Enter to
apply the crop operation.
Cropping in perspective
6
Getting into perspective
SHORTCUTS
MAC WIN BOTH
171
3
When you drag the other two corners, they’ll
move independently: a grid appears, showing
the perspective of the scene as it will be corrected
after the operation.
7
Here’s the result of the crop operation, after I’ve applied a little extra contrast correction and painted out the slight
reflection in the white mount at the top. Compare this with the photograph taken straight-on, right, and you’ll see that the
size and shape of the print is identical: the only difference is that it doesn’t have my silhouette bending over it.
4
But there’s a problem with Adobe’s math. There’s a center point
marker, and by default it’s located at the intersection of the mid
points of each side, as shown here. This is incorrect: for true perspective
correction, it should be located on the intersection of the diagonals.
HOT TIP
The Perspective
Crop tool is new
to CS6. Previously,
from CS2 onwards,
it was available
within the Crop
tool as a checkbox
option on the
Options bar. You
can see how it
behaved in the
PDF in the Cut
Pages folder on
the website.
How to Cheat in Photoshop CC
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