[枚举 枚举 描述 ExifColorSpace ExifContrast ExifCustomRendered ExifExposureMode ExifExposureProgram ExifFileSource ExifFlash ExifGainControl ExifGPSAltitudeRef ExifLightSource ExifMeteringMode ExifOrientation ExifSaturation ExifSceneCaptureType ExifSensingMethod ExifSubjectDistanceRange ExifUnit ExifWhiteBalance ExifYCbCrPositioning]
