Render crops image from compositor

Question

I made a 3D tracking, and noticed that after rendering the image is cropped. I got the camera through the 3D tracking. Why is this happening and can we fix it without making new 3D tracking?

Here is a screenshot at the top is the compositor, and below is render:

check to make sure that your render settings for the scene are set to the same size as the background image. — David, Apr 22 '15 at 21:29
@David Thank you! That was my mistake! :) It worked! P.S. I don't know, how to mark a comment as the answer?) — Rumata, Apr 22 '15 at 21:41
He needs to post an answer, if he doesn't do it in around 12hrs someone else can post it instead for you. — J Sargent, Apr 22 '15 at 22:02

score 4 · Accepted Answer · answered Apr 22 '15 at 22:46

When compositing a render over an image you have to make sure that your render dimensions for the scene are set to the same size as the background image.

Your other option (say if the picture quite large) is to scale the picture to match the render size.

That can be done by adding a Scale node set to Render Size, which will give you a node setup like this.
compositor nodes

Render crops image from compositor

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