CGImageProperties中定义的字典意义
//TIFF信息字典
const CFStringRef kCGImagePropertyTIFFDictionary;
/GIF信息字典
const CFStringRef kCGImagePropertyGIFDictionary;
//JFIF信息字典
const CFStringRef kCGImagePropertyJFIFDictionary;
//EXif信息字典
const CFStringRef kCGImagePropertyExifDictionary;
//PNG信息字典
const CFStringRef kCGImagePropertyPNGDictionary;
//IPTC信息字典
const CFStringRef kCGImagePropertyIPTCDictionary;
//GPS信息字典
const CFStringRef kCGImagePropertyGPSDictionary;
//原始信息字典
const CFStringRef kCGImagePropertyRawDictionary;
//CIFF信息字典
const CFStringRef kCGImagePropertyCIFFDictionary;
//佳能相机信息字典
const CFStringRef kCGImagePropertyMakerCanonDictionary;
//尼康相机信息字典
const CFStringRef kCGImagePropertyMakerNikonDictionary;
//柯尼卡相机信息字典
const CFStringRef kCGImagePropertyMakerMinoltaDictionary;
//富士相机信息字典
const CFStringRef kCGImagePropertyMakerFujiDictionary;
//奥林巴斯相机信息字典
const CFStringRef kCGImagePropertyMakerOlympusDictionary;
//宾得相机信息字典
const CFStringRef kCGImagePropertyMakerPentaxDictionary;
//对应Photoshop相片的信息字典
const CFStringRef kCGImageProperty8BIMDictionary;
//NDG信息字典
const CFStringRef kCGImagePropertyDNGDictionary ;
//ExifAux信息字典
const CFStringRef kCGImagePropertyExifAuxDictionary;
//OpenEXR信息字典
const CFStringRef kCGImagePropertyOpenEXRDictionary;
//Apple相机信息字典
const CFStringRef kCGImagePropertyMakerAppleDictionary ;
CGImageSourceCopyProperties方法返回的字典中还可能会有如下一个特殊的键
//对应文件大小
const CFStringRef kCGImagePropertyFileSize;
CGImageSourceCopyPropertiesAtIndex方法中可能包含的特殊键：
//像素高度
const CFStringRef kCGImagePropertyPixelHeight;
//像素宽度
const CFStringRef kCGImagePropertyPixelWidth;
//DPI高度
const CFStringRef kCGImagePropertyDPIHeight;
//DPI宽度
const CFStringRef kCGImagePropertyDPIWidth;
//颜色位数
const CFStringRef kCGImagePropertyDepth;
//图片的显示方向
/*
对应Number值
* 1 = 左上到右下.
* 2 = 右上到左下.
* 3 = 右下到左上.
* 4 = 左下到右上.
* 5 = 行列置换 左上到右下.
* 6 = 行列置换 右上到左下.
* 7 = 行列置换 右下到左上.
* 8 = 行列置换 左下到右上.
*/
const CFStringRef kCGImagePropertyOrientation;
//颜色是否支持浮点数
const CFStringRef kCGImagePropertyIsFloat;
//图像是否包含像素样本
const CFStringRef kCGImagePropertyIsIndexed;
//图像是否包含alpha通道
const CFStringRef kCGImagePropertyHasAlpha;
//图像的颜色模式
const CFStringRef kCGImagePropertyColorModel;
//嵌入图片的ICC配置文件名称
const CFStringRef kCGImagePropertyProfileName;
kCGImagePropertyColorModel键可返回的值有如下几种定义：
//RBG模式
const CFStringRef kCGImagePropertyColorModelRGB;
//Gray模式
const CFStringRef kCGImagePropertyColorModelGray;
//CMYK模式
const CFStringRef kCGImagePropertyColorModelCMYK;
//Lab模式
const CFStringRef kCGImagePropertyColorModelLab;
kCGImagePropertyTIFFDictionary键可返回的值定义如下：
//图片数据压缩方案
const CFStringRef kCGImagePropertyTIFFCompression;
//图片数据的色彩空间
const CFStringRef kCGImagePropertyTIFFPhotometricInterpretation;
//文档名称
const CFStringRef kCGImagePropertyTIFFDocumentName;
//图片描述
const CFStringRef kCGImagePropertyTIFFImageDescription;
//相机设备名
const CFStringRef kCGImagePropertyTIFFMake;
//相机设备模式
const CFStringRef kCGImagePropertyTIFFModel;
//图片方向
const CFStringRef kCGImagePropertyTIFFOrientation;
//横向每个分辨位的像素数
const CFStringRef kCGImagePropertyTIFFXResolution;
//纵向每个分辨位的像素数
const CFStringRef kCGImagePropertyTIFFYResolution;
//分辨率单位
const CFStringRef kCGImagePropertyTIFFResolutionUnit;
//创建图像的软件名称和版本
const CFStringRef kCGImagePropertyTIFFSoftware;
//transform函数
const CFStringRef kCGImagePropertyTIFFTransferFunction;
//日期时间
const CFStringRef kCGImagePropertyTIFFDateTime;
//作者
const CFStringRef kCGImagePropertyTIFFArtist;
//创建图片的电脑系统
const CFStringRef kCGImagePropertyTIFFHostComputer;
//公司信息
const CFStringRef kCGImagePropertyTIFFCopyright;
//图片的白点
const CFStringRef kCGImagePropertyTIFFWhitePoint;
//图像的原色色度
const CFStringRef kCGImagePropertyTIFFPrimaryChromaticities;
//图片的瓦片宽度
const CFStringRef kCGImagePropertyTIFFTileWidth;
//图片的瓦片高度
const CFStringRef kCGImagePropertyTIFFTileLength;
kCGImagePropertyJFIFDictionary对应的字典中可能包含如下意义的键：
//JFIF版本
const CFStringRef kCGImagePropertyJFIFVersion;
//横向像素密度
const CFStringRef kCGImagePropertyJFIFXDensity;
//纵向像素密度
const CFStringRef kCGImagePropertyJFIFYDensity;
//像素密度单元
const CFStringRef kCGImagePropertyJFIFDensityUnit;
//是否是高质量图像版本
const CFStringRef kCGImagePropertyJFIFIsProgressive;
kCGImagePropertyExifDictionary对应的字典中可能包含如下意义的键 ：
//曝光时间
const CFStringRef kCGImagePropertyExifExposureTime;
//ExifNumber
const CFStringRef kCGImagePropertyExifFNumber;
//曝光程序
const CFStringRef kCGImagePropertyExifExposureProgram;
//每个通道的光谱灵敏度
const CFStringRef kCGImagePropertyExifSpectralSensitivity;
//ISO速度等级
const CFStringRef kCGImagePropertyExifISOSpeedRatings;
//ExifOECF
const CFStringRef kCGImagePropertyExifOECF;
//灵敏类型
const CFStringRef kCGImagePropertyExifSensitivityType;
//输出灵敏标准
const CFStringRef kCGImagePropertyExifStandardOutputSensitivity;
//推荐曝光指数
const CFStringRef kCGImagePropertyExifRecommendedExposureIndex;
//ISO速率
const CFStringRef kCGImagePropertyExifISOSpeed;
const CFStringRef kCGImagePropertyExifISOSpeedLatitudeyyy;
const CFStringRef kCGImagePropertyExifISOSpeedLatitudezzz;
//Exif版本
const CFStringRef kCGImagePropertyExifVersion;
//原始日期时间
const CFStringRef kCGImagePropertyExifDateTimeOriginal;
//数字化日期时间
const CFStringRef kCGImagePropertyExifDateTimeDigitized;
//压缩配置
const CFStringRef kCGImagePropertyExifComponentsConfiguration;
//压缩模式像素位
const CFStringRef kCGImagePropertyExifCompressedBitsPerPixel;
//快门速度值
const CFStringRef kCGImagePropertyExifShutterSpeedValue;
//孔径值
const CFStringRef kCGImagePropertyExifApertureValue;
//亮度值
const CFStringRef kCGImagePropertyExifBrightnessValue;
//曝光偏差值
const CFStringRef kCGImagePropertyExifExposureBiasValue;
//最大光圈值
const CFStringRef kCGImagePropertyExifMaxApertureValue;
//距离
const CFStringRef kCGImagePropertyExifSubjectDistance;
//测光模式
const CFStringRef kCGImagePropertyExifMeteringMode;
//光源
const CFStringRef kCGImagePropertyExifLightSource;
//拍摄时的闪光状态
const CFStringRef kCGImagePropertyExifFlash;
//焦距
const CFStringRef kCGImagePropertyExifFocalLength;
//主体区域
const CFStringRef kCGImagePropertyExifSubjectArea;
//相机制造商指定的信息
const CFStringRef kCGImagePropertyExifMakerNote;
//用户信息
const CFStringRef kCGImagePropertyExifUserComment;
//日期和时间标记的秒分数
const CFStringRef kCGImagePropertyExifSubsecTime;
//原始时间
const CFStringRef kCGImagePropertyExifSubsecTimeOriginal;
//数字时间
const CFStringRef kCGImagePropertyExifSubsecTimeDigitized;
//FlashPix版本信息
const CFStringRef kCGImagePropertyExifFlashPixVersion;
//色彩空间
const CFStringRef kCGImagePropertyExifColorSpace;
//X方向像素
const CFStringRef kCGImagePropertyExifPixelXDimension;
//Y方向像素
const CFStringRef kCGImagePropertyExifPixelYDimension;
//与图像相关的声音文件
const CFStringRef kCGImagePropertyExifRelatedSoundFile;
//FlashEnergy
const CFStringRef kCGImagePropertyExifFlashEnergy;
//FrequencyResponse
const CFStringRef kCGImagePropertyExifSpatialFrequencyResponse;
//像素数目
const CFStringRef kCGImagePropertyExifFocalPlaneXResolution;
const CFStringRef kCGImagePropertyExifFocalPlaneYResolution;
const CFStringRef kCGImagePropertyExifFocalPlaneResolutionUnit;
//图像主体的位置
const CFStringRef kCGImagePropertyExifSubjectLocation;
//选择的曝光指数
const CFStringRef kCGImagePropertyExifExposureIndex;
//传感器类型
const CFStringRef kCGImagePropertyExifSensingMethod;
//图像文件源
const CFStringRef kCGImagePropertyExifFileSource;
//场景类型
const CFStringRef kCGImagePropertyExifSceneType;
//CFA模块
const CFStringRef kCGImagePropertyExifCFAPattern;
//对图像数据进行特殊渲染
const CFStringRef kCGImagePropertyExifCustomRendered;
//曝光模式设置
const CFStringRef kCGImagePropertyExifExposureMode;
//白平衡模式
const CFStringRef kCGImagePropertyExifWhiteBalance;
//数字变焦比
const CFStringRef kCGImagePropertyExifDigitalZoomRatio;
//35毫米胶片的等效焦距
const CFStringRef kCGImagePropertyExifFocalLenIn35mmFilm;
//场景捕捉类型（标准，景观，肖像，夜晚）
const CFStringRef kCGImagePropertyExifSceneCaptureType;
//图像增益
const CFStringRef kCGImagePropertyExifGainControl;
//图像对比度
const CFStringRef kCGImagePropertyExifContrast;
//图像饱和度
const CFStringRef kCGImagePropertyExifSaturation;
//图像锐度
const CFStringRef kCGImagePropertyExifSharpness;
//拍摄条件
const CFStringRef kCGImagePropertyExifDeviceSettingDescription;
//主体距离
const CFStringRef kCGImagePropertyExifSubjectDistRange;
//图像的唯一标识
const CFStringRef kCGImagePropertyExifImageUniqueID;
//相机所有者
const CFStringRef kCGImagePropertyExifCameraOwnerName;
//相机序列号
const CFStringRef kCGImagePropertyExifBodySerialNumber;
//透镜规格信息
const CFStringRef kCGImagePropertyExifLensSpecification;
//透镜制造商名称
const CFStringRef kCGImagePropertyExifLensMake;
//透镜模式
const CFStringRef kCGImagePropertyExifLensModel;
//透镜序列号
const CFStringRef kCGImagePropertyExifLensSerialNumber;
//伽马设置
const CFStringRef kCGImagePropertyExifGamma;
kCGImagePropertyExifAuxDictionary对应的字典中可能包含的键定义如下：
//镜头信息
const CFStringRef kCGImagePropertyExifAuxLensInfo;
//镜头模式
const CFStringRef kCGImagePropertyExifAuxLensModel;
//序列号
const CFStringRef kCGImagePropertyExifAuxSerialNumber;
//镜头ID
const CFStringRef kCGImagePropertyExifAuxLensID;
//镜头序列号
const CFStringRef kCGImagePropertyExifAuxLensSerialNumber;
//图片编号
const CFStringRef kCGImagePropertyExifAuxImageNumber;
//闪光补偿
const CFStringRef kCGImagePropertyExifAuxFlashCompensation;
//所有者名称
const CFStringRef kCGImagePropertyExifAuxOwnerName;
//固件信息
const CFStringRef kCGImagePropertyExifAuxFirmware;
kCGImagePropertyGIFDictionary对应的字典中可能包含的键定义如下
//动画循环次数
const CFStringRef kCGImagePropertyGIFLoopCount;
//两帧之间的延时
const CFStringRef kCGImagePropertyGIFDelayTime;
//颜色Map
const CFStringRef kCGImagePropertyGIFImageColorMap;
const CFStringRef kCGImagePropertyGIFHasGlobalColorMap;
//两帧之间的延时
const CFStringRef kCGImagePropertyGIFUnclampedDelayTime;
kCGImagePropertyPNGDictionary对应的字典中可能包含的键定义如下：
//PNG伽马值
const CFStringRef kCGImagePropertyPNGGamma;
//混合类型
const CFStringRef kCGImagePropertyPNGInterlaceType;
//X方向像素数
const CFStringRef kCGImagePropertyPNGXPixelsPerMeter;
//Y方向像素数
const CFStringRef kCGImagePropertyPNGYPixelsPerMeter;
//RGB意图
const CFStringRef kCGImagePropertyPNGsRGBIntent;
//色度
const CFStringRef kCGImagePropertyPNGChromaticities;
//作者
const CFStringRef kCGImagePropertyPNGAuthor;
//公司
const CFStringRef kCGImagePropertyPNGCopyright;
//创建时间
const CFStringRef kCGImagePropertyPNGCreationTime;
//描述
const CFStringRef kCGImagePropertyPNGDescription;
//最后修改日期时间
const CFStringRef kCGImagePropertyPNGModificationTime;
//软件
const CFStringRef kCGImagePropertyPNGSoftware;
//标题
const CFStringRef kCGImagePropertyPNGTitle;
//动画循环次数
const CFStringRef kCGImagePropertyAPNGLoopCount;
//两帧之间的延时
const CFStringRef kCGImagePropertyAPNGDelayTime;
const CFStringRef kCGImagePropertyAPNGUnclampedDelayTime;
kCGImagePropertyGPSDictionary对应的字典中可能包含的键定义如下：
//GPS版本
const CFStringRef kCGImagePropertyGPSVersion;
//纬度是南纬或北纬
const CFStringRef kCGImagePropertyGPSLatitudeRef;
//纬度
const CFStringRef kCGImagePropertyGPSLatitude;
//经度是东经或西经
const CFStringRef kCGImagePropertyGPSLongitudeRef;
//经度
const CFStringRef kCGImagePropertyGPSLongitude;
//海拔标准
const CFStringRef kCGImagePropertyGPSAltitudeRef;
//海拔高度
const CFStringRef kCGImagePropertyGPSAltitude;
//时间戳
const CFStringRef kCGImagePropertyGPSTimeStamp;
//测量GPS的卫星
const CFStringRef kCGImagePropertyGPSSatellites;
//GPS状态
const CFStringRef kCGImagePropertyGPSStatus;
//测量模式
const CFStringRef kCGImagePropertyGPSMeasureMode;
//精度数据
const CFStringRef kCGImagePropertyGPSDOP;
//速度标准
const CFStringRef kCGImagePropertyGPSSpeedRef;
//速度
const CFStringRef kCGImagePropertyGPSSpeed;
//运动方向参考
const CFStringRef kCGImagePropertyGPSTrackRef;
//运动方向
const CFStringRef kCGImagePropertyGPSTrack;
//位置方向参考
const CFStringRef kCGImagePropertyGPSImgDirectionRef;
//位置方向
const CFStringRef kCGImagePropertyGPSImgDirection;
//地图测量数据
const CFStringRef kCGImagePropertyGPSMapDatum;
//地理纬度南纬或北纬
const CFStringRef kCGImagePropertyGPSDestLatitudeRef;
//地理纬度
const CFStringRef kCGImagePropertyGPSDestLatitude;
//地理经度 东经或西经
const CFStringRef kCGImagePropertyGPSDestLongitudeRef;
//地理经度
const CFStringRef kCGImagePropertyGPSDestLongitude;
//方位参照
const CFStringRef kCGImagePropertyGPSDestBearingRef;
//地理方位
const CFStringRef kCGImagePropertyGPSDestBearing;
//距离参照
const CFStringRef kCGImagePropertyGPSDestDistanceRef;
//距离
const CFStringRef kCGImagePropertyGPSDestDistance;
//查找地理位置的方法
const CFStringRef kCGImagePropertyGPSProcessingMethod;
//GPS地区名
const CFStringRef kCGImagePropertyGPSAreaInformation;
//日期时间
const CFStringRef kCGImagePropertyGPSDateStamp;
//校正信息
const CFStringRef kCGImagePropertyGPSDifferental;
//错误信息
const CFStringRef kCGImagePropertyGPSHPositioningError;
kCGImagePropertyIPTCDictionary对应的字典中可能包含的键定义如下：
//对象类型
const CFStringRef kCGImagePropertyIPTCObjectTypeReference;
//对象属性
const CFStringRef kCGImagePropertyIPTCObjectAttributeReference;
//对象名称
const CFStringRef kCGImagePropertyIPTCObjectName;
//编辑状态
const CFStringRef kCGImagePropertyIPTCEditStatus;
//更新状态
const CFStringRef kCGImagePropertyIPTCEditorialUpdate;
//紧急等级
const CFStringRef kCGImagePropertyIPTCUrgency;
//主体
const CFStringRef kCGImagePropertyIPTCSubjectReference;
//类别
const CFStringRef kCGImagePropertyIPTCCategory;
//补充类别
const CFStringRef kCGImagePropertyIPTCSupplementalCategory;
//Fixture标识
const CFStringRef kCGImagePropertyIPTCFixtureIdentifier;
//关键字
const CFStringRef kCGImagePropertyIPTCKeywords;
//内容定位码
const CFStringRef kCGImagePropertyIPTCContentLocationCode;
//内容位置名称
const CFStringRef kCGImagePropertyIPTCContentLocationName;
//图像使用的最早日期
const CFStringRef kCGImagePropertyIPTCReleaseDate;
//图像使用的最早时间
const CFStringRef kCGImagePropertyIPTCReleaseTime;
//最后一次使用日期
const CFStringRef kCGImagePropertyIPTCExpirationDate;
//最后一次使用时间
const CFStringRef kCGImagePropertyIPTCExpirationTime;
//图像使用的特别说明
const CFStringRef kCGImagePropertyIPTCSpecialInstructions;
//建议行为
const CFStringRef kCGImagePropertyIPTCActionAdvised;
//服务参考
const CFStringRef kCGImagePropertyIPTCReferenceService;
//日期参考
const CFStringRef kCGImagePropertyIPTCReferenceDate;
//参考码
const CFStringRef kCGImagePropertyIPTCReferenceNumber;
//创建日期
const CFStringRef kCGImagePropertyIPTCDateCreated;
//创建时间
const CFStringRef kCGImagePropertyIPTCTimeCreated;
//数字创建日期
const CFStringRef kCGImagePropertyIPTCDigitalCreationDate;
//数字创建时间
const CFStringRef kCGImagePropertyIPTCDigitalCreationTime;
//原始程序
const CFStringRef kCGImagePropertyIPTCOriginatingProgram;
//程序版本
const CFStringRef kCGImagePropertyIPTCProgramVersion;
图像的编辑周期（早晨，晚上或两者）。
const CFStringRef kCGImagePropertyIPTCObjectCycle;
//不想创建者名称
const CFStringRef kCGImagePropertyIPTCByline;
//图像创建标题
const CFStringRef kCGImagePropertyIPTCBylineTitle;
//城市信息
const CFStringRef kCGImagePropertyIPTCCity;
//城市内位置
const CFStringRef kCGImagePropertyIPTCSubLocation;
//省份
const CFStringRef kCGImagePropertyIPTCProvinceState;
//国家编码
const CFStringRef kCGImagePropertyIPTCCountryPrimaryLocationCode;
//国家名称
const CFStringRef kCGImagePropertyIPTCCountryPrimaryLocationName;
//OriginalTransmission参考
const CFStringRef kCGImagePropertyIPTCOriginalTransmissionReference;
//图像内容摘要
const CFStringRef kCGImagePropertyIPTCHeadline;
//提供图像服务的名称
const CFStringRef kCGImagePropertyIPTCCredit;
//图像源
const CFStringRef kCGImagePropertyIPTCSource;
//公司提示
const CFStringRef kCGImagePropertyIPTCCopyrightNotice;
//联系人
const CFStringRef kCGImagePropertyIPTCContact;
//描述
const CFStringRef kCGImagePropertyIPTCCaptionAbstract;
//图像编辑者
const CFStringRef kCGImagePropertyIPTCWriterEditor;
//图像类型
const CFStringRef kCGImagePropertyIPTCImageType;
//方向信息
const CFStringRef kCGImagePropertyIPTCImageOrientation;
//语言信息
const CFStringRef kCGImagePropertyIPTCLanguageIdentifier;
//星级
const CFStringRef kCGImagePropertyIPTCStarRating;
//联系人详细信息
const CFStringRef kCGImagePropertyIPTCCreatorContactInfo;
//图像使用权限
const CFStringRef kCGImagePropertyIPTCRightsUsageTerms;
//场景代码
const CFStringRef kCGImagePropertyIPTCScene;
上面的kCGImagePropertyIPTCCreatorContactInfo对应的字典中键的定义如下：
//联系人城市
const CFStringRef kCGImagePropertyIPTCContactInfoCity;
//联系人国家
const CFStringRef kCGImagePropertyIPTCContactInfoCountry;
//联系人地址
const CFStringRef kCGImagePropertyIPTCContactInfoAddress;
//邮编
const CFStringRef kCGImagePropertyIPTCContactInfoPostalCode;
//省份
const CFStringRef kCGImagePropertyIPTCContactInfoStateProvince;
//电子邮件
const CFStringRef kCGImagePropertyIPTCContactInfoEmails;
//电话
const CFStringRef kCGImagePropertyIPTCContactInfoPhones;
//网址
const CFStringRef kCGImagePropertyIPTCContactInfoWebURLs;
kCGImageProperty8BIMDictionary对应的字典中可能包含的键定义如下：
//Photoshop文件的图层名
const CFStringRef kCGImageProperty8BIMLayerNames;
//版本
const CFStringRef kCGImageProperty8BIMVersion;
kCGImagePropertyDNGDictionary对应的字典中可能包含的键定义如下：
//DNG版本
const CFStringRef kCGImagePropertyDNGVersion;
//兼容的最老版本
const CFStringRef kCGImagePropertyDNGBackwardVersion;
//摄像机模型
const CFStringRef kCGImagePropertyDNGUniqueCameraModel;
const CFStringRef kCGImagePropertyDNGLocalizedCameraModel;
//相机序列码
const CFStringRef kCGImagePropertyDNGCameraSerialNumber;
//镜头信息
const CFStringRef kCGImagePropertyDNGLensInfo;
//黑度等级
const CFStringRef kCGImagePropertyDNGBlackLevel;
//白度等级
const CFStringRef kCGImagePropertyDNGWhiteLevel;
const CFStringRef kCGImagePropertyDNGCalibrationIlluminant1;
const CFStringRef kCGImagePropertyDNGCalibrationIlluminant2;
const CFStringRef kCGImagePropertyDNGColorMatrix1;
const CFStringRef kCGImagePropertyDNGColorMatrix2;
const CFStringRef kCGImagePropertyDNGCameraCalibration1;
const CFStringRef kCGImagePropertyDNGCameraCalibration2;
const CFStringRef kCGImagePropertyDNGAsShotNeutral;
const CFStringRef kCGImagePropertyDNGAsShotWhiteXY;
const CFStringRef kCGImagePropertyDNGBaselineExposure;
const CFStringRef kCGImagePropertyDNGBaselineNoise;
const CFStringRef kCGImagePropertyDNGBaselineSharpness;
const CFStringRef kCGImagePropertyDNGPrivateData;
const CFStringRef kCGImagePropertyDNGCameraCalibrationSignature;
const CFStringRef kCGImagePropertyDNGProfileCalibrationSignature;
const CFStringRef kCGImagePropertyDNGNoiseProfile;
const CFStringRef kCGImagePropertyDNGWarpRectilinear;
const CFStringRef kCGImagePropertyDNGWarpFisheye;
const CFStringRef kCGImagePropertyDNGFixVignetteRadial;
kCGImagePropertyCIFFDictionary对应的字典中可能包含的键定义如下：
//相机信息
const CFStringRef kCGImagePropertyCIFFDescription;
//固件版本
const CFStringRef kCGImagePropertyCIFFFirmware;
//所有者名称
const CFStringRef kCGImagePropertyCIFFOwnerName;
//图片名
const CFStringRef kCGImagePropertyCIFFImageName;
//图片文件名
const CFStringRef kCGImagePropertyCIFFImageFileName;
//曝光方式
const CFStringRef kCGImagePropertyCIFFReleaseMethod;
//曝光时间
const CFStringRef kCGImagePropertyCIFFReleaseTiming;
//RecordID
const CFStringRef kCGImagePropertyCIFFRecordID;
//曝光时间
const CFStringRef kCGImagePropertyCIFFSelfTimingTime;
//相机序列号
const CFStringRef kCGImagePropertyCIFFCameraSerialNumber;
//图片编码
const CFStringRef kCGImagePropertyCIFFImageSerialNumber;
//驱动模式
const CFStringRef kCGImagePropertyCIFFContinuousDrive);
//焦点模式
const CFStringRef kCGImagePropertyCIFFFocusMode;
//测量模式
const CFStringRef kCGImagePropertyCIFFMeteringMode;
//曝光模式
const CFStringRef kCGImagePropertyCIFFShootingMode;
//透镜模式
const CFStringRef kCGImagePropertyCIFFLensModel;
//最长镜头长度
const CFStringRef kCGImagePropertyCIFFLensMaxMM;
//最短镜头长度
const CFStringRef kCGImagePropertyCIFFLensMinMM;
//白平衡等级
const CFStringRef kCGImagePropertyCIFFWhiteBalanceIndex;
//曝光补偿
const CFStringRef kCGImagePropertyCIFFFlashExposureComp;
//实测曝光值
const CFStringRef kCGImagePropertyCIFFMeasuredEV);
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