ImageGear for C and C++ on Windows v21.0 - Updated
API Reference Guide / Core Component API Reference / Core Component Enumerations Reference / enumIGExtraChannelType
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    enumIGExtraChannelType
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    This enumeration specifies types of extra channels (Unknown, Mask or Spot).

    Values:

    IG_EXTRA_CHANNEL_TYPE_Unknown Unknown extra channel.
    IG_EXTRA_CHANNEL_TYPE_Mask Alpha mask channel.
    IG_EXTRA_CHANNEL_TYPE_Spot Spot color channel.