Graphics Programs Reference
In-Depth Information
Step Six:
This image has all sorts of lens night-
mares going on. First, the buildings look
like they're leaning in toward each other.
Secondly, there's a geometric distortion
problem here (the buildings are bowing
outward), as well, and lastly, the image
is a little crooked. We can fix all of these
in the Custom tab. Let's start by turning
off Auto Correction (turn off the Geo-
metric Distortion checkbox in the Auto
Correction tab, as shown here).
TIP: It's Auto-Cropping
Behind the Scenes
When you make geometric distortion
corrections like this, you'll see that it
seems to crop in a little bit tighter on your
photo. That's because it does. What it's
doing is automatically correcting for the
fact that when it unbowed your image, it
had to bow the outside edges a bit (leav-
ing big gaps on the edges), so it automati-
cally scales up the image a little to crop
off those messed-up edges. If you want
to see what's really going on, drag the
Scale slider (at the bottom of the dialog)
to anything less than 100%, and you'll
see the edges.
Step Seven:
Now, let's get the buildings straight,
so they don't fall over into the road. Go
down to the Transform section, but this
time you'll need to drag the Vertical Per-
spective slider to the left (the perspective
problem is the opposite of what it was
with the columns—these buildings are
leaning inward). So, drag it over until the
buildings look straighter (as shown here).
I dragged over to -14, which gets the
fronts of the buildings looking good, but
the right side of the building on the left
still looks a little off. If I drag any farther,
though, the rest of the image starts to
lean, so we should stop about there.
(Continued)
