Key Transition

Microsoft DirectShow 9.0

Key Transition

The Key transition performs keying based on RGB value, alpha value, hue or luminance.

The following image shows the key transition:

Class ID (CLSID): {C5B19592-145E-11D3-9F04-006008039E37}

CLSID Variable Name: CLSID_DxtKey

Friendly Name: "DxtKey"

Properties

Property	Type	Valid range	Description	Applies To
Hue	int	0–360	The hue value on which to key.	Hue
Invert	BOOL	FALSE or TRUE	Boolean value indicating whether to invert the default operation of the key. If FALSE, pixels in the overlying image are made transparent in the default manner. If TRUE, the operation inverts.	Chroma, Hue, Luminance, Nonred
KeyType	int	See Remarks	Specifies the type of key. For more information, see Remarks.	All
Luminance	int	0–100	The luminance value on which to key.	Luminance
RGB	DWORD	0x0 – 0xFFFFFF	The color on which to key. The value is a hexadecimal number with the format 0xRRGGBB, where RR is the red value, GG is the green value, and BB is the blue value. (Pure red, green, and blue are 0xFF0000, 0x00FF00, and 0x0000FF, respectively.)	Chroma
Similarity	int	0–100	The range of color data that becomes transparent. At higher values, a wider range of similar colors is transparent.	Chroma, Nonred

Remarks

The type of key that is performed depends on the value of the KeyType property, which must be one of the following:

Value	Enumeration	Description
0	DXTKEY_RGB	Chroma key (key by RGB value).
1	DXTKEY_NONRED	Nonred key. (Makes blue and green areas transparent.)
2	DXTKEY_LUMINANCE	Luminance key.
3	DXTKEY_ALPHA	Key by alpha value.
4	DXTKEY_HUE	Key by hue.

The key type defaults to DXTKEY_ALPHA.