形狀透明

描述

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

參數

參數	數值	描述
圖片或視訊資源	選擇檔案	Select the file (image or video) to be used as the mask
柔和度	浮點數	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).
反轉	開關	Invert the alpha channel
使用 luma	開關	Use the Luma information instead of the alpha channel
使用閥值	開關	Use the Threshold value
Offset	時間碼	Start position of the mask file
Out	時間碼	End position of the mask file
閾值	百分比	Sets the threshold for making opaqueness and transparency. Values below the value are made opaque, values above transparent.

備註

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

範例

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: