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I remember some old video editing programs used a grayscale image to be used as a transition pattern.

Basically what they did was using the different levels of a grayscale image as a step for the transition.

Here is an example. Given the first image, when the program was analyzing the gray level marked with the red line as a threshold, the transition would look like the image below.

enter image description here

Do you know if that can be done in a free program like Davinci Resolve, Hit Film, probably Blender?

And a tip of how can be implemented?

images by pixabay

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What you want is called a Gradient Wipe in Premiere Pro or a Luma Fade in Davinci Resolve.

Just make sure your gradient image is a 3rd layer as long as your transition, and is selected as the 'gradient layer.'

(This should be a comment but I don't have enough karma to comment in this forum. Hope this helps :) )

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    No, in fact this is an answer, :o) Let me explore it and come back. Thanks.
    – Rafael
    Oct 8 '19 at 14:52
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    I'd be interested in seeing a solution to this using FFmpeg. There is a way to merge two videos with a png mask and I'd assume it works with a video mask, but you'd still need a way to convert the single gradient image into an animated mask.
    – evn
    Oct 8 '19 at 18:31

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