Photoshop
CS2 offered many novelties to digital photo enthusiasts. One of those
was the filter pack for correcting the most common lens defects, such as
vignetting. This issue is primarily caused by an optical defect in the
lens, but possible reasons also include an intruding filter glass,
converter or sun shade. If you don't take such elements into account or
have no option to counter them when shooting, then only good old
Photoshop remains.
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1.
Load the photo
Most
of the time, vignetting can only be noticed on homogeneous
areas like a blue sky. Of course, if it is as prominent
as in our sample picture, it will always be detectable and
annoying. Get your Photoshop ready!
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2.
Mr. Corrector
Click
Filter/Distort/Lens Correction.
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3.
Jack of all trades
The
dialog offers a cure for many optical defects, but for now,
the Vignette section will suffice. Before
you begin, enlarge the preview on the lower left so that
it comfortably shows one darkened corner. If you're already
working with a large photo, you probably won't need this.
However, be sure to toggle Show Grid off,
as it will most likely just disturb your work.
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4.
Getting the values right
Under
Vignette, you can specify two settings:
effect intensity (Amount) and transition
size (Midpoint).
The
Amount slider can be set between +/-100.
Positive values (right side) lightens the corners, while
negative ones (left side) darkens them even more. In this
example, common sense suggested a value about +30.
As
the action will mainly affect the corners, use Midpoint
to specify the size of the area left undarkened. Possible
values are from 0 to 100
(the default is 50).When set to 0,
only the very middle of the picture is left unchanged, and
the rest will lighten up (or, if you say so, darken) with
a soft transition towards the corners. When set to 100,
most of the picture will remain unchanged, and only the
far corners will be adjusted with a fast transition. For
this photo, we chose a value of 57.
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5.
Everything's clear
In
the end, the corners show a more even lightness. Like we
said in the beginning, this is most obvious in homogeneous
areas, but of course it affects all corners just the same.
Compare this to the original picture!
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Hope you can
learn something new from this tutorial.
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Reference:
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