: After Effects - create a square mask and have an image slide through it I have a rectangular image, let's pretend it's a wide picture of New York city's skyline. I want to create a rectangle

@BetL875

Posted in: #AdobeAfterEffects

I have a rectangular image, let's pretend it's a wide picture of New York city's skyline.

I want to create a rectangle in the center of my canvas. Then I want to horizontally slide the picture of New York through the rectangle, so only part of it is showing at a time.

How can I do this?

What I've tried:


Right click the image layer, then "Mask" > "New Mask". Resize the mask square to be the size I want. Problem: When I translate the image horizontally, the mask moves with it.
If I create a mask as a seperate layer, it doesn't hide the image.

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