How to create this effect directly in app:
Here are the steps for creating this "postcard" effect directly in the Do Ink Green Screen app using their Mask function applied to an image over a video.
Creating the effect using a template:
Creating a template makes the project much easier for young learners or lessons with a time crunch. I made this template in Keynote using instant alpha to erase the center space. I like the template because of the drop shadow I can apply to the postcard shape and hand.
More examples of this technique
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