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Chapter 8 - Video Digitizer Components / Video Digitizer Components Reference

Video Digitizer Component Functions / Selectively Displaying Video

VDSetKeyColorRange

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 VDSetKeyColorRange function allows your application to define a key color range.

pascal VideoDigitizerError VDSetKeyColorRange
                               (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 contains the lower bound of the key color range. All colors in the color table between the color specified by the minRGB parameter and the color specified by the maxRGB parameter are considered key colors.

maxRGB

Contains a pointer to a field that contains the upper bound of the key color range. All colors in the color table between the color specified by the minRGB parameter and the color specified by the maxRGB parameter are considered key colors.

DESCRIPTION

If the digitizer component cannot accommodate all the colors that are defined in the specified range, it returns a result value of noMoreKeyColors.

RESULT CODES

noErr	0	No error
digiUnimpErr	-2201	Function not supported
noMoreKeyColors	-2205	Key color list is full

SEE ALSO

Your application can obtain the current key color range by calling the VDGetKeyColorRange function, which is described on page 8-85.

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