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Chapter 8 - Video Digitizer Components / Video Digitizer Components Reference

Video Digitizer Component Functions / Selectively Displaying Video

VDGetKeyColorRange

Some video digitizer components that support key colors may allow applications to set a range of key color values. The key color range is expressed as a range of RGB color values. The VDGetKeyColorRange function allows applications to obtain the currently defined key color range.

pascal VideoDigitizerError VDGetKeyColorRange
                            (VideoDigitizerComponent ci,
                              RGBColor *minRGB, 
                              RGBColor *maxRGB);

ci

Specifies the video digitizer component for the request. Applications obtain this reference from the Component Manager's OpenComponent function.

minRGB

Contains a pointer to a field that is to receive the lower bound of the key color range. The video digitizer component places the RGB color that corresponds to the lower end of the range in the field referred to by this parameter.

maxRGB

Contains a pointer to a field that is to receive the upper bound of the key color range. The video digitizer component places the RGB color that corresponds to the upper end of the range in the field referred to by this parameter.

RESULT CODES

noErr	0	No error
digiUnimpErr	-2201	Function not supported
badCallOrder	-2209	Digitizer component not ready for this function

SEE ALSO

Your application can set the color range by calling the VDSetKeyColorRange function, which is described on page 8-83.

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