Shape Alpha¶

Description

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

Parameters

Parameter	Value	Description
Image or video resource	File Selection	Select the file (image or video) to be used as the mask
Threshold	Percentage	Sets the threshold for making opaqueness and transparency. Values below the value are made opaque, values above transparent.
Softness	Float	When using Threshold determines how soft to make the edge around the threshold. Similar to feathering. 0.0 means no softness (hard edge), 1.0 means very soft (default is 0.10).
Invert	Switch	Invert the alpha channel
Use Luma	Switch	Use the Luma information instead of the alpha channel
Use Threshold	Switch	Use the Threshold value

Notes

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

Examples

Select the file you want to use for the mask

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

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 a PGM image file with Luma: