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You use the
cmSigVideoCardGammaType
constant to specify the signature type for a video card gamma tag. That is, you use this constant to set the
typeDescriptor
field of the
CMVideoCardGammaType
structure. There is currently only one type possible for a video card gamma tag.
enum
{
cmSigVideoCardGammaType = FOUR_CHAR_CODE('vcgt')
};