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Situation: I am setting up a Vignette effect for my scene. Like what I do normally, I have a lens distortion node, math node (set to 'greater than'), blur node, and a mix node (set to multiply).

Problem: However, for this scene, the vignette effect seem to have a weird shape and it's not symmetrical either. Below is the result. How do I fix this? Thanks. Here is my blend file

enter image description here enter image description here enter image description here

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This seems like a nug to me, but try unchecking the clamp box, in the math converter node. –  someonewithpc Jul 17 at 13:23
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@someonewithpc it is not a "nug" or a bug, the odd shape is just the black and white mountain distorted. –  David Jul 17 at 19:56

2 Answers 2

up vote 4 down vote accepted

Creating a vignette can be done much more simple by creating an ellipse mask node and tweaking the size value and then blurring it and multiply it with your image.

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How is this simpler than using a method that uses relative dimensions, and thus always has the rigth size? While this works it's not the best option. –  someonewithpc Jul 17 at 13:18

That weird shape looks a hell of a lot like a distorted mountain to me. You shouldn't plug your source image into the Lens Distorsion. You could instead take a Distort-->Scale node, in Render Size mode, so that you have a totally white image.

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