Inside Macintosh: QuickTime Components /

Chapter 8 - Video Digitizer Components / Video Digitizer Components Reference

Video Digitizer Component Functions / Controlling Analog Video

VDSetHue

The VDSetHue function sets the current hue value. Hue is similar to the tint control on a television, and it is specified in degrees with complementary colors set 180 degrees apart (red is 0, green is +120, and blue is -120). Video digitizer components support hue values that range from 0 (-180 shift in hue) to 65,535 (+179 shift in hue), where 32,767 represents a 0 shift in hue.

pascal VideoDigitizerError VDSetHue (VideoDigitizerComponent ci,
                                     unsigned short *hue);

ci

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

hue

Contains a pointer to an integer that contains the new hue value. The video digitizer component attempts to set the hue value to the value specified by this parameter. The digitizer component returns the new value, so that the application can avoid using unsupported values in future requests.

RESULT CODES

noErr	0	No error
digiUnimpErr	-2201	Function not supported
qtParamErr	-2202	Invalid parameter value

SEE ALSO

Your application can obtain the current hue value by calling the VDGetHue function (described in the next section). To retrieve the recommended hue value, your application can call the VDGetVideoDefaults function (described on page 8-66).

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