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I am using blender 2.91 for Mac. I am trying to animate an inflating balloon flying away on a still image. When I toggle to camera view everything looks ok, yet when I go to render the animation I get a darker image with a hexadecagon border around the image. I attached two screenshots below to provide further context for my question. Thank you in advance!

Camera View

Render View

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    $\begingroup$ maybe you've given a Subdisivision Surface modifier to your image, check the modifiers panel $\endgroup$
    – moonboots
    Commented Jan 16, 2021 at 10:05
  • $\begingroup$ You were right, Thank you so much! $\endgroup$
    – S.G
    Commented Jan 16, 2021 at 11:53

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Here's a plane:

enter image description here

Here's the same plane with a subsurf modifier:

enter image description here

Now the object has more vertices instead of the original 4.

The subdivision modifier creates new "virtual" geometry, by interpolating the existing edges and faces.

The Subdivision Surface modifier (often shorten to “Subdiv”) is used to split the faces of a mesh into smaller faces, giving it a smooth appearance. It enables you to create complex smooth surfaces while modeling simple, low-vertex meshes. It avoids the need to save and maintain huge amounts of data, and gives a smooth “organic” look to the object.

If you use (default) Catmul-clark subdivision the object will be rounded.

To keep the plane like a parallelogram, use Simple subdivision:

enter image description here

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