should trim the video clip along the edges, in order to remove the dark
borders and garbage produced along the edges by the displacement and
Go to the Tools panel, look for the selection tools below the first row
of tools: Lasso, Rectangle, Oval and Magic Wand
< Click the Rectangle selection
tool (2nd row of tools)
click-and-drag a selection near the edges, but away enough from the
border so as to avoid the dark noise.
click to enlarge
After making such a selection, you can verify if it is small enough so
the unwanted garbage along the edges is excluded. You can scrub through
the timeline, or use the Lef/Right cursor (arrow) keys to quickly
verify each frame.
Once you're satisfied with the selection, use the menu:
Image > Crop to
This will crop each frame of the animation to the selection.
Before you save the cropped animation to an AVI file, verify that it is
of proper dimensions. It may be too small, and even worse, it may have
an odd number of pixels in width or height.
Some compression codecs require a multiple of 4 or 8 pixels in width or
height, so be sure to resample to something more standard after
Here for example, we see the width at 219 pixels and height at 175
pixels. Definitely not acceptable by many codecs. We should resample up
to 220 or down to 216, most likely for width.
Select the menu:
Image > Resample...
to change the size to a more usable dimension in width and height. This
will resize and resample all frames of an animation.
Notice that after resampling (or also after loading an image sequence
from file) you may have an active alpha selection showing the full
image selected,, as evidenced by the marching ants around the
frame. Use Control-D or select menu:
Alpha > Clear alpha
if you find this distracting.
Here's an example of the finished animation, after cropping and
resampling to the new size of 400x316 pixels, up from 219x175:
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