I have a after effects template whose preset is 1920*1080 , but I need the output to be in 20 * 8 sq feet. How can I change the whole project composition settings to fit the screen ? I tried to scale the project by using "File -> scripts -> scale composition .jsx" but I change the width, then the height changes simultaneously.
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There is not automatic way to scale a composition without constrained proportions, but the right way to do it would be to:
- Parent your layers to a null layer;
- Open composition settings and set the desired width and height;
- Scale the null layer accordingly;
- (Optional) Delete the null layer.

Sébastien Lavoie
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