Chroma key
Chroma Key
Description
Chroma Key
The chroma key feature is activated as follows:
- load a background image with SetImageOverlayFromImageFile (or another SetImageOverlayFrom... function)
- enable the ImageOverlayEnabled property
- enable the ImageOverlay_ChromaKey property
- assign the chroma key RGB color to use to the ImageOverlay_ChromaKeyRGBColor property
- adjust the chroma key leeway % (optional) with the ImageOverlay_ChromaKeyLeewayPercent property (the default value is 25%)
E.g.:
VideoGrabber.PlayerFileName := 'my video clip.avi';
VideoGrabber.SetImageOverlayFromImageFile ('my background image.jpg');
VideoGrabber.ImageOverlay_ChromaKeyRGBColor := $FF0000; // the blue color
VideoGrabber.ImageOverlay_ChromaKeyLeewayPercent := 20; // 20%
VideoGrabber.ImageOverlay_ChromaKey := true;
VideoGrabber.ImageOverlayEnabled := true;
VideoGrabber.OpenPlayer;
To use several image overlay, see "Applying several image overlays concurrently" in the "Graphic overlays" chapter.
See Also
ImageOverlay_ChromaKey ImageOverlay_ChromaKeyLeewayPercent ImageOverlay_ChromaKeyRGBColor