Shape Alpha

This effect creates an alpha channel (transparency) based on a file (e.g. PNG with alpha, PGM with luma information)

Shape Alpha effect panel

You can use a static image file or a video for animated masks

Shape Alpha selecting the resource

Select the file you want to use for the mask

Shape Alpha error message in case no alpha

If the selected image or video file does not have an alpha channel, Kdenlive displays this warning message

Shape Alpha using Luma information

Instead of the alpha channel you can use the Luma information in the file

This is an example for how the Shape Alpha effect looks like when using an PGM with Luma:

Shape Alpha effect applied