Use the Optics
Compensation effect to add or remove camera lens distortion. Elements
composited with mismatched lens distortion cause anomalies in the animation.
For example, tracked objects in a distorted scene don’t match the scene
area because linear objects don’t follow the distortion of the scene.
This effect works with 8-bpc, 16-bpc, and 32-bpc color.
- Field Of View (FOV)
-
The field of view (FOV) of the
distorted footage. The FOV is relative to the size of the source
layer and the selected FOV Orientation. The distortion amount is
relative to FOV. There is no general rule as to what FOV value applies
to different lenses. Zooming in reduces the FOV, and zooming out increases
it. Consequently, if footage includes different zoom values, you’ll
need to animate the FOV value.
- Reverse Lens Distortion
-
Reverses the lens distortion. For example, to remove wide-angle
lens distortion, set Field Of View to 40.0 and select Reverse Lens Distortion.
Selecting Reverse Lens Distortion enables the Resize control.
- FOV Orientation
-
The axis on which the Field Of View value is based. This
setting is useful when matching computer-generated elements to the
rendered view angle.
- View Center
-
Specifies an alternate center point of view. This setting
is useful when using custom lenses that aren’t centered. However,
in most cases, this control should be left untouched.
- Optimal Pixels
-
Maintains as much pixel information as possible through the distortion.
When selected, FOV values are no longer reversible.
- Resize
-
Resizes the layer when the applied distortion stretches the
layer beyond its boundaries. To use this control, first select Reverse
Lens Distortion, and then choose an option. Off doesn’t resize the
layer. Max 2X resizes the layer to a maximum of twice the original
width and height. Max 4X resizes the layer to a maximum of four
times the original width and height. Unlimited resizes the layer as
far as it is stretched. This option may require a large amount of
memory.
To match FOV values, layers must be the same size. However,
if you select Resize, you can apply Optics Compensation again and
reverse the distortion using the same value (reversed). You can
then apply another effect between the two instances of Optics Compensation.
If
you resize a layer using Optics Compensation and then precompose
it into a larger composition, you cannot reverse the distortion
using the same value until you enlarge the precomposed layer to
accommodate the expanded layer.
- Select the layer with the distortion, and choose
Effect > Distort > Optics Compensation.
- In the Effect Controls panel, adjust the FOV until a
distorted edge or line appears straight. Note the FOV value.
- Select the computer graphic layer you want to distort,
and apply Optics Compensation to it using the FOV value from step
2.
- Select Reverse Lens Distortion.
- Remove Optics Compensation from the footage layer.
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