Chroma key

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.