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CGImageProperties Reference

Framework	ApplicationServices/ImageIO
Declared in	CGImageProperties.h

Overview

CGImageProperties Reference defines constants that represent characteristics of images used by the Image I/O framework.

Constants

Format-Specific Dictionaries

Properties that have an associated dictionary of file-format or metadata-format specific key-value pairs.

CFStringRef kCGImagePropertyTIFFDictionary;
CFStringRef kCGImagePropertyGIFDictionary;
CFStringRef kCGImagePropertyJFIFDictionary;
CFStringRef kCGImagePropertyExifDictionary;
CFStringRef kCGImagePropertyPNGDictionary;
CFStringRef kCGImagePropertyIPTCDictionary;
CFStringRef kCGImagePropertyGPSDictionary;
CFStringRef kCGImagePropertyRawDictionary;
CFStringRef kCGImagePropertyCIFFDictionary;
CFStringRef kCGImageProperty8BIMDictionary;
CFStringRef kCGImagePropertyDNGDictionary;
CFStringRef kCGImagePropertyExifAuxDictionary;

Constants

kCGImagePropertyTIFFDictionary: A dictionary of key-value pairs for an image that uses Tagged Image File Format (TIFF). See “TIFF Dictionary Keys.”
kCGImagePropertyGIFDictionary: A dictionary of key-value pairs for an image that uses Graphics Interchange Format (GIF). See “GIF Dictionary Keys.”
kCGImagePropertyJFIFDictionary: A dictionary of key-value pairs for an image that uses JPEG File Interchange Format (JFIF). See “JFIF Dictionary Keys.”
kCGImagePropertyExifDictionary: A dictionary of key-value pairs for an image that uses Exchangeable Image File Format (EXIF). See “EXIF Dictionary Keys.”
kCGImagePropertyPNGDictionary: A dictionary of key-value pairs for an image that uses Portable Network Graphics (PNG) format. See “PNG Dictionary Keys.”
kCGImagePropertyIPTCDictionary: A dictionary of key-value pairs for an image that uses International Press Telecommunications Council (IPTC) metadata. See “IPTC Dictionary Keys.”
kCGImagePropertyGPSDictionary: A dictionary of key-value pairs for an image that has Global Positioning System (GPS) information. See “GPS Dictionary Keys.”
kCGImagePropertyRawDictionary: A dictionary of key-value pairs for an image that contains minimally processed, or raw, data.
kCGImagePropertyCIFFDictionary: A dictionary of key-value pairs for an image that uses Camera Image File Format (CIFF). See “CIFF Dictionary Keys.”
kCGImageProperty8BIMDictionary: A dictionary of key-value pairs for an Adobe Photoshop image. See “8BIM Dictionary Keys.”
kCGImagePropertyDNGDictionary: A dictionary of key-value pairs for an image that uses the Digital Negative (DNG) archival format. See “DNG Dictionary Keys.”
kCGImagePropertyExifAuxDictionary: An auxiliary dictionary of key-value pairs for an image that uses Exchangeable Image File Format (EXIF).

Discussion

If any of these constants are returned by the functionsCGImageSourceCopyProperties or CGImageSourceCopyPropertiesAtIndex the associated value is a dictionary of file-format or metadata-format specific key-value pairs.

Declared In

CGImageProperties.h

Camera Maker Dictionaries

Properties that have an associated dictionary of key-value pairs for a specific camera manufacturer.

CFStringRef kCGImagePropertyMakerCanonDictionary;
CFStringRef kCGImagePropertyMakerNikonDictionary;
CFStringRef kCGImagePropertyMakerMinoltaDictionary;
CFStringRef kCGImagePropertyMakerFujiDictionary;
CFStringRef kCGImagePropertyMakerOlympusDictionary;
CFStringRef kCGImagePropertyMakerPentaxDictionary;

Constants

kCGImagePropertyMakerCanonDictionary: A dictionary of key-value pairs for an image from a Canon camera. See “Canon Camera Dictionary Keys.”
kCGImagePropertyMakerNikonDictionary: A dictionary of key-value pairs for an image from a Nikon camera. See “Nikon Camera Dictionary Keys.”
kCGImagePropertyMakerMinoltaDictionary: A dictionary of key-value pairs for an image from a Minolta camera.
kCGImagePropertyMakerFujiDictionary: A dictionary of key-value pairs for an image from a Fuji camera.
kCGImagePropertyMakerOlympusDictionary: A dictionary of key-value pairs for an image from a Olympus camera.
kCGImagePropertyMakerPentaxDictionary: A dictionary of key-value pairs for an image from a Pentax camera.

Declared In

CGImageProperties.h

Image Source Container Properties

Properties that apply to the container in general but not necessarily to any individual image in the container.

CFStringRef kCGImagePropertyFileSize;

Constants

kCGImagePropertyFileSize: The size of the image file in bytes, if known. If present, this key is a CFNumber value.

Discussion

These properties can be returned by the function CGImageSourceCopyProperties.

Declared In

CGImageProperties.h

Individual Image Properties

Properties that apply to an individual image in an image source.

CFStringRef kCGImagePropertyDPIHeight;
CFStringRef kCGImagePropertyDPIWidth;
CFStringRef kCGImagePropertyPixelWidth;
CFStringRef kCGImagePropertyPixelHeight;
CFStringRef kCGImagePropertyDepth;
CFStringRef kCGImagePropertyOrientation;
CFStringRef kCGImagePropertyIsFloat;
CFStringRef kCGImagePropertyIsIndexed;
CFStringRef kCGImagePropertyHasAlpha;
CFStringRef kCGImagePropertyColorModel;
CFStringRef kCGImagePropertyProfileName;

Constants

kCGImagePropertyDPIHeight

The resolution, in dots per inch, in the x dimension. If present, this key is a CFNumber value.

kCGImagePropertyDPIWidth

The resolution, in dots per inch, in the y dimension. If present, this key is a CFNumber value.

kCGImagePropertyPixelWidth

The number of pixels in the x dimension. If present, this key is a CFNumber value.

kCGImagePropertyPixelHeight

The number of pixels in the y dimension. If present, this key is a CFNumber value.

kCGImagePropertyDepth

The number of bits in each color sample of each pixel. If present, this key is a CFNumber value.

kCGImagePropertyOrientation

The intended display orientation of the image. If present, this key is a CFNumber value with the same value as defined by the TIFF and EXIF specifications. The value specifies where the origin (0,0) of the image is locates, as shown in Table 1. If not present, a value of 1 is assumed.

**Table 1**
Value	Location of the origin of the image
1	Top, left
2	Top, right
3	Bottom, right
4	Bottom, left
5	Left, top
6	Right, top
7	Right, bottom
8	Left, bottom

kCGImagePropertyIsFloat

Whether or not the image contains floating-point pixel samples. The value of this key is kCFBooleanTrue if the image contains them.

kCGImagePropertyIsIndexed

Whether or not the image contains indexed pixel samples (sometimes called paletted samples). The value of this key is kCFBooleanTrue if the image contains them.

kCGImagePropertyHasAlpha

Whether or not the image has an alpha channel. The value of this key is kCFBooleanTrue if the image contains an alpha channel.

kCGImagePropertyColorModel

The color model of the image such as, "RGB", "CMYK", "Gray", or "Lab". The value of this key is CFStringRef.

kCGImagePropertyProfileName

The name of the optional ICC profile embedded in the image, if known. If present, the value of this key is a CFStringRef.

Discussion

These properties can be returned by the function CGImageSourceCopyPropertiesAtIndex.

Declared In

CGImageProperties.h

Color Model Values

Values for the color model property.

const CFStringRef kCGImagePropertyColorModelRGB;
const CFStringRef kCGImagePropertyColorModelGray;
const CFStringRef kCGImagePropertyColorModelCMYK;
const CFStringRef kCGImagePropertyColorModelLab;

Constants

kCGImagePropertyColorModelRGB: An RGB color model.
kCGImagePropertyColorModelGray: A Gray color model.
kCGImagePropertyColorModelCMYK: A CMYK color model.
kCGImagePropertyColorModelLab: A Lab color model.

Discussion

A color model describes how color values are represented mathematically. A color space is a color model combined with a definition of how to interpret values within the model.

Declared In

CGImageProperties.h

EXIF Dictionary Keys

Keys for for an image that uses Exchangeable Image File Format (EXIF).

const CFStringRef kCGImagePropertyExifExposureTime;
const CFStringRef kCGImagePropertyExifFNumber;
const CFStringRef kCGImagePropertyExifExposureProgram;
const CFStringRef kCGImagePropertyExifSpectralSensitivity;
const CFStringRef kCGImagePropertyExifISOSpeedRatings;
const CFStringRef kCGImagePropertyExifOECF;
const CFStringRef kCGImagePropertyExifVersion;
const CFStringRef kCGImagePropertyExifDateTimeOriginal;
const CFStringRef kCGImagePropertyExifDateTimeDigitized;
const CFStringRef kCGImagePropertyExifComponentsConfiguration;
const CFStringRef kCGImagePropertyExifCompressedBitsPerPixel;
const CFStringRef kCGImagePropertyExifShutterSpeedValue;
const CFStringRef kCGImagePropertyExifApertureValue;
const CFStringRef kCGImagePropertyExifBrightnessValue;
const CFStringRef kCGImagePropertyExifExposureBiasValue;
const CFStringRef kCGImagePropertyExifMaxApertureValue;
const CFStringRef kCGImagePropertyExifSubjectDistance;
const CFStringRef kCGImagePropertyExifMeteringMode;
const CFStringRef kCGImagePropertyExifLightSource;
const CFStringRef kCGImagePropertyExifFlash;
const CFStringRef kCGImagePropertyExifFocalLength;
const CFStringRef kCGImagePropertyExifSubjectArea;
const CFStringRef kCGImagePropertyExifMakerNote;
const CFStringRef kCGImagePropertyExifUserComment;
const CFStringRef kCGImagePropertyExifSubsecTime;
const CFStringRef kCGImagePropertyExifSubsecTimeOrginal;
const CFStringRef kCGImagePropertyExifSubsecTimeDigitized;
const CFStringRef kCGImagePropertyExifFlashPixVersion;
const CFStringRef kCGImagePropertyExifColorSpace;
const CFStringRef kCGImagePropertyExifPixelXDimension;
const CFStringRef kCGImagePropertyExifPixelYDimension;
const CFStringRef kCGImagePropertyExifRelatedSoundFile;
const CFStringRef kCGImagePropertyExifFlashEnergy;
const CFStringRef kCGImagePropertyExifSpatialFrequencyResponse;
const CFStringRef kCGImagePropertyExifFocalPlaneXResolution;
const CFStringRef kCGImagePropertyExifFocalPlaneYResolution;
const CFStringRef kCGImagePropertyExifFocalPlaneResolutionUnit;
const CFStringRef kCGImagePropertyExifSubjectLocation;
const CFStringRef kCGImagePropertyExifExposureIndex;
const CFStringRef kCGImagePropertyExifSensingMethod;
const CFStringRef kCGImagePropertyExifFileSource;
const CFStringRef kCGImagePropertyExifSceneType;
const CFStringRef kCGImagePropertyExifCFAPattern;
const CFStringRef kCGImagePropertyExifCustomRendered;
const CFStringRef kCGImagePropertyExifExposureMode;
const CFStringRef kCGImagePropertyExifWhiteBalance;
const CFStringRef kCGImagePropertyExifDigitalZoomRatio;
const CFStringRef kCGImagePropertyExifFocalLenIn35mmFilm;
const CFStringRef kCGImagePropertyExifSceneCaptureType;
const CFStringRef kCGImagePropertyExifGainControl;
const CFStringRef kCGImagePropertyExifContrast;
const CFStringRef kCGImagePropertyExifSaturation;
const CFStringRef kCGImagePropertyExifSharpness;
const CFStringRef kCGImagePropertyExifDeviceSettingDescription;
const CFStringRef kCGImagePropertyExifSubjectDistRange;
const CFStringRef kCGImagePropertyExifImageUniqueID;
const CFStringRef kCGImagePropertyExifGamma;

Constants

kCGImagePropertyExifExposureTime: The exposure time.
kCGImagePropertyExifFNumber: The F number.
kCGImagePropertyExifExposureProgram: The exposure program.
kCGImagePropertyExifSpectralSensitivity: The spectral sensitivity of each channel.
kCGImagePropertyExifISOSpeedRatings: ISO speed ratings.
kCGImagePropertyExifOECF: The opto-electrical conversion function (OECF), which defines the relationship between the optical input of the camera and the image values.
kCGImagePropertyExifVersion: The version.
kCGImagePropertyExifDateTimeOriginal: The original date and time.
kCGImagePropertyExifDateTimeDigitized: The digitized date and time.
kCGImagePropertyExifComponentsConfiguration: The components configuration. For compressed data, specifies that the channels of each component are arranged in increasing numeric order (from first component to the fourth).
kCGImagePropertyExifCompressedBitsPerPixel: The compressed bits per pixel.
kCGImagePropertyExifShutterSpeedValue: The shutter speed value.
kCGImagePropertyExifApertureValue: The aperture value.
kCGImagePropertyExifBrightnessValue: The brightness value.
kCGImagePropertyExifExposureBiasValue: The exposure bias value.
kCGImagePropertyExifMaxApertureValue: The maximum aperture value.
kCGImagePropertyExifSubjectDistance: The distance to the subject, in meters.
kCGImagePropertyExifMeteringMode: The metering mode.
kCGImagePropertyExifLightSource: The light source.
kCGImagePropertyExifFlash: The flash status when the image was shot.
kCGImagePropertyExifFocalLength: The focal length.
kCGImagePropertyExifSubjectArea: The subject area.
kCGImagePropertyExifMakerNote: A maker note.
kCGImagePropertyExifUserComment: A user comment.
kCGImagePropertyExifSubsecTime: The fraction of seconds for the date and time tag.
kCGImagePropertyExifSubsecTimeOrginal: The fraction of seconds for the original date and time tag.
kCGImagePropertyExifSubsecTimeDigitized: The fraction of seconds for the digitized time tag.
kCGImagePropertyExifFlashPixVersion: The FlashPix version supported by an FPXR file. FlashPix is a format for multi-resolution, tiled images, that facilitates fast onscreen viewing.
kCGImagePropertyExifColorSpace: The color space.
kCGImagePropertyExifPixelXDimension: The pixel x dimension.
kCGImagePropertyExifPixelYDimension: The pixel y dimension.
kCGImagePropertyExifRelatedSoundFile: A related sound file.
kCGImagePropertyExifFlashEnergy: The strobe energy when the image was captures, in beam candle power seconds.
kCGImagePropertyExifSpatialFrequencyResponse: The spatial frequency table and spatial frequency response values in the direction of image width, image height, and diagonal directions. See ISO 12233..
kCGImagePropertyExifFocalPlaneXResolution: The number of image-width pixels (x) per focal plane resolution unit.
kCGImagePropertyExifFocalPlaneYResolution: The number of image-height pixels (y)per focal plane resolution unit.
kCGImagePropertyExifFocalPlaneResolutionUnit: The unit of measurement for the focal plane x and y tags.
kCGImagePropertyExifSubjectLocation: The location of the scene’s primary subject.
kCGImagePropertyExifExposureIndex: The selected exposure index.
kCGImagePropertyExifSensingMethod: The sensor type of the camera or input device.
kCGImagePropertyExifFileSource: The image source.
kCGImagePropertyExifSceneType: The scene type.
kCGImagePropertyExifCFAPattern: The color filter array (CFA) pattern, which is the geometric patter of the image sensor for a 1-chip color sensor area.
kCGImagePropertyExifCustomRendered: Special rendering performed on the image data.
kCGImagePropertyExifExposureMode: The exposure mode setting.
kCGImagePropertyExifWhiteBalance: The white balance mode.
kCGImagePropertyExifDigitalZoomRatio: The digital zoom ratio.
kCGImagePropertyExifFocalLenIn35mmFilm: The equivalent focal length in 35 mm film.
kCGImagePropertyExifSceneCaptureType: The scene capture type (standard, landscape, portrait, night).
kCGImagePropertyExifGainControl: The gain adjustment applied to the image.
kCGImagePropertyExifContrast: The contrast applied to the image.
kCGImagePropertyExifSaturation: The saturation applied to the image.
kCGImagePropertyExifSharpness: The sharpness applied to the image.
kCGImagePropertyExifDeviceSettingDescription: For a particular camera mode, indicates the conditions for taking the picture.
kCGImagePropertyExifSubjectDistRange: The subject distance range.
kCGImagePropertyExifImageUniqueID: The unique ID of the image.
kCGImagePropertyExifGamma: The gamma setting.

Declared In

CGImageProperties.h

EXIF Auxiliary Dictionary Keys

Auxiliary keys for for an image that uses Exchangeable Image File Format (EXIF).

const CFStringRef kCGImagePropertyExifAuxLensInfo;
const CFStringRef kCGImagePropertyExifAuxLensModel;
const CFStringRef kCGImagePropertyExifAuxSerialNumber;
const CFStringRef kCGImagePropertyExifAuxLensID;
const CFStringRef kCGImagePropertyExifAuxLensSerialNumber;
const CFStringRef kCGImagePropertyExifAuxImageNumber;
const CFStringRef kCGImagePropertyExifAuxFlashCompensation;
const CFStringRef kCGImagePropertyExifAuxOwnerName;
const CFStringRef kCGImagePropertyExifAuxFirmware;

Constants

kCGImagePropertyExifAuxLensInfo: Lens information.
kCGImagePropertyExifAuxLensModel: The lens model.
kCGImagePropertyExifAuxSerialNumber: The serial number.
kCGImagePropertyExifAuxLensID: The lens ID.
kCGImagePropertyExifAuxLensSerialNumber: The lens serial number.
kCGImagePropertyExifAuxImageNumber: The image number.
kCGImagePropertyExifAuxFlashCompensation: Flash compensation.
kCGImagePropertyExifAuxOwnerName: The owner name.
kCGImagePropertyExifAuxFirmware: Firmware information.

Declared In

CGImageProperties.h

GIF Dictionary Keys

Keys for an image that uses Graphics Interchange Format (GIF).

const CFStringRef kCGImagePropertyGIFLoopCount;
const CFStringRef kCGImagePropertyGIFDelayTime;
const CFStringRef kCGImagePropertyGIFImageColorMap;
const CFStringRef kCGImagePropertyGIFHasGlobalColorMap;

Constants

kCGImagePropertyGIFLoopCount: The loop count.
kCGImagePropertyGIFDelayTime: The delay time.
kCGImagePropertyGIFImageColorMap: The image color map.
kCGImagePropertyGIFHasGlobalColorMap: Whether or not the GIF has a global color map.

Declared In

CGImageProperties.h

GPS Dictionary Keys

Keys for an image that has Global Positioning System (GPS) information.

const CFStringRef kCGImagePropertyGPSVersion;
const CFStringRef kCGImagePropertyGPSLatitudeRef;
const CFStringRef kCGImagePropertyGPSLatitude;
const CFStringRef kCGImagePropertyGPSLongitudeRef;
const CFStringRef kCGImagePropertyGPSLongitude;
const CFStringRef kCGImagePropertyGPSAltitudeRef;
const CFStringRef kCGImagePropertyGPSAltitude;
const CFStringRef kCGImagePropertyGPSTimeStamp;
const CFStringRef kCGImagePropertyGPSSatellites;
const CFStringRef kCGImagePropertyGPSStatus;
const CFStringRef kCGImagePropertyGPSMeasureMode;
const CFStringRef kCGImagePropertyGPSDOP;
const CFStringRef kCGImagePropertyGPSSpeedRef;
const CFStringRef kCGImagePropertyGPSSpeed;
const CFStringRef kCGImagePropertyGPSTrackRef;
const CFStringRef kCGImagePropertyGPSTrack;
const CFStringRef kCGImagePropertyGPSImgDirectionRef;
const CFStringRef kCGImagePropertyGPSImgDirection;
const CFStringRef kCGImagePropertyGPSMapDatum;
const CFStringRef kCGImagePropertyGPSDestLatitudeRef;
const CFStringRef kCGImagePropertyGPSDestLatitude;
const CFStringRef kCGImagePropertyGPSDestLongitudeRef;
const CFStringRef kCGImagePropertyGPSDestLongitude;
const CFStringRef kCGImagePropertyGPSDestBearingRef;
const CFStringRef kCGImagePropertyGPSDestBearing;
const CFStringRef kCGImagePropertyGPSDestDistanceRef;
const CFStringRef kCGImagePropertyGPSDestDistance;
const CFStringRef kCGImagePropertyGPSProcessingMethod;
const CFStringRef kCGImagePropertyGPSAreaInformation;
const CFStringRef kCGImagePropertyGPSDateStamp;
const CFStringRef kCGImagePropertyGPSDifferental;

Constants

kCGImagePropertyGPSVersion: The version.
kCGImagePropertyGPSLatitudeRef: Whether the latitude is northern or southern.
kCGImagePropertyGPSLatitude: The latitude.
kCGImagePropertyGPSLongitudeRef: Whether the longitude is east or west.
kCGImagePropertyGPSLongitude: The longitude.
kCGImagePropertyGPSAltitudeRef: The reference altitude.
kCGImagePropertyGPSAltitude: The altitude.
kCGImagePropertyGPSTimeStamp: The time as UTC (Coordinated Universal Time).
kCGImagePropertyGPSSatellites: The satellites used for GPS measurements.
kCGImagePropertyGPSStatus: The status of the GPS receiver.
kCGImagePropertyGPSMeasureMode: The measurement mode.
kCGImagePropertyGPSDOP: The data degree of precision (DOP).
kCGImagePropertyGPSSpeedRef: The unit for expressing the GPS receiver speed of movement.
kCGImagePropertyGPSSpeed: The GPS receiver speed of movement.
kCGImagePropertyGPSTrackRef: The reference for the direction of GPS receiver movement.
kCGImagePropertyGPSTrack: The direction of GPS receiver movement.
kCGImagePropertyGPSImgDirectionRef: The reference for the direction of the image.
kCGImagePropertyGPSImgDirection: The direction of the image.
kCGImagePropertyGPSMapDatum: The geodetic survey data used by the GPS receiver.
kCGImagePropertyGPSDestLatitudeRef: Whether the latitude of the destination point is northern or southern.
kCGImagePropertyGPSDestLatitude: The latitude of the destination point.
kCGImagePropertyGPSDestLongitudeRef: Whether the longitude of the destination point is east or west.
kCGImagePropertyGPSDestLongitude: The longitude of the destination point.
kCGImagePropertyGPSDestBearingRef: The reference for giving the bearing to the destination point.
kCGImagePropertyGPSDestBearing: The bearing to the destination point.
kCGImagePropertyGPSDestDistanceRef: The units for expressing the distance to the destination point.
kCGImagePropertyGPSDestDistance: The distance to the destination point.
kCGImagePropertyGPSProcessingMethod: The name of the method used for finding a location.
kCGImagePropertyGPSAreaInformation: The name of the GPS area.
kCGImagePropertyGPSDateStamp: The data and time information relative to Coordinated Universal Time (UTC).
kCGImagePropertyGPSDifferental: Whether differential correction is applied to the GPS receiver.

Declared In

CGImageProperties.h

IPTC Dictionary Keys

Keys for an image that uses International Press Telecommunications Council (IPTC) metadata.

const CFStringRef kCGImagePropertyIPTCObjectTypeReference;
const CFStringRef kCGImagePropertyIPTCObjectAttributeReference;
const CFStringRef kCGImagePropertyIPTCObjectName;
const CFStringRef kCGImagePropertyIPTCEditStatus;
const CFStringRef kCGImagePropertyIPTCEditorialUpdate;
const CFStringRef kCGImagePropertyIPTCUrgency;
const CFStringRef kCGImagePropertyIPTCSubjectReference;
const CFStringRef kCGImagePropertyIPTCCategory;
const CFStringRef kCGImagePropertyIPTCSupplementalCategory;
const CFStringRef kCGImagePropertyIPTCFixtureIdentifier;
const CFStringRef kCGImagePropertyIPTCKeywords;
const CFStringRef kCGImagePropertyIPTCContentLocationCode;
const CFStringRef kCGImagePropertyIPTCContentLocationName;
const CFStringRef kCGImagePropertyIPTCReleaseDate;
const CFStringRef kCGImagePropertyIPTCReleaseTime;
const CFStringRef kCGImagePropertyIPTCExpirationDate;
const CFStringRef kCGImagePropertyIPTCExpirationTime;
const CFStringRef kCGImagePropertyIPTCSpecialInstructions;
const CFStringRef kCGImagePropertyIPTCActionAdvised;
const CFStringRef kCGImagePropertyIPTCReferenceService;
const CFStringRef kCGImagePropertyIPTCReferenceDate;
const CFStringRef kCGImagePropertyIPTCReferenceNumber;
const CFStringRef kCGImagePropertyIPTCDateCreated;
const CFStringRef kCGImagePropertyIPTCTimeCreated;
const CFStringRef kCGImagePropertyIPTCDigitalCreationDate;
const CFStringRef kCGImagePropertyIPTCDigitalCreationTime;
const CFStringRef kCGImagePropertyIPTCOriginatingProgram;
const CFStringRef kCGImagePropertyIPTCProgramVersion;
const CFStringRef kCGImagePropertyIPTCObjectCycle;
const CFStringRef kCGImagePropertyIPTCByline;
const CFStringRef kCGImagePropertyIPTCBylineTitle;
const CFStringRef kCGImagePropertyIPTCCity;
const CFStringRef kCGImagePropertyIPTCSubLocation;
const CFStringRef kCGImagePropertyIPTCProvinceState;
const CFStringRef kCGImagePropertyIPTCCountryPrimaryLocationCode;
const CFStringRef kCGImagePropertyIPTCCountryPrimaryLocationName;
const CFStringRef kCGImagePropertyIPTCOriginalTransmissionReference;
const CFStringRef kCGImagePropertyIPTCHeadline;
const CFStringRef kCGImagePropertyIPTCCredit;
const CFStringRef kCGImagePropertyIPTCSource;
const CFStringRef kCGImagePropertyIPTCCopyrightNotice;
const CFStringRef kCGImagePropertyIPTCContact;
const CFStringRef kCGImagePropertyIPTCCaptionAbstract;
const CFStringRef kCGImagePropertyIPTCWriterEditor;
const CFStringRef kCGImagePropertyIPTCImageType;
const CFStringRef kCGImagePropertyIPTCImageOrientation;
const CFStringRef kCGImagePropertyIPTCLanguageIdentifier;
const CFStringRef kCGImagePropertyIPTCStarRating;

Constants

kCGImagePropertyIPTCObjectTypeReference: The object type.
kCGImagePropertyIPTCObjectAttributeReference: The object attribute.
kCGImagePropertyIPTCObjectName: The object name.
kCGImagePropertyIPTCEditStatus: The edit status.
kCGImagePropertyIPTCEditorialUpdate: An editorial update.
kCGImagePropertyIPTCUrgency: The urgency level.
kCGImagePropertyIPTCSubjectReference: The subject.
kCGImagePropertyIPTCCategory: The category.
kCGImagePropertyIPTCSupplementalCategory: A supplemental category.
kCGImagePropertyIPTCFixtureIdentifier: A fixture identifier.
kCGImagePropertyIPTCKeywords: Keywords.
kCGImagePropertyIPTCContentLocationCode: The content location code.
kCGImagePropertyIPTCContentLocationName: The content location name.
kCGImagePropertyIPTCReleaseDate: The release date.
kCGImagePropertyIPTCReleaseTime: The release time.
kCGImagePropertyIPTCExpirationDate: The expiration date.
kCGImagePropertyIPTCExpirationTime: The expiration time.
kCGImagePropertyIPTCSpecialInstructions: Special instructions.
kCGImagePropertyIPTCActionAdvised: The advised action.
kCGImagePropertyIPTCReferenceService: The reference service.
kCGImagePropertyIPTCReferenceDate: The reference date.
kCGImagePropertyIPTCReferenceNumber: The reference number.
kCGImagePropertyIPTCDateCreated: The date created.
kCGImagePropertyIPTCTimeCreated: The time created.
kCGImagePropertyIPTCDigitalCreationDate: The digital creation date.
kCGImagePropertyIPTCDigitalCreationTime: The digital creation time.
kCGImagePropertyIPTCOriginatingProgram: The originating program.
kCGImagePropertyIPTCProgramVersion: The program version.
kCGImagePropertyIPTCObjectCycle: The object cycle.
kCGImagePropertyIPTCByline: The byline.
kCGImagePropertyIPTCBylineTitle: The byline title.
kCGImagePropertyIPTCCity: The city.
kCGImagePropertyIPTCSubLocation: The sublocation.
kCGImagePropertyIPTCProvinceState: The province or state.
kCGImagePropertyIPTCCountryPrimaryLocationCode: The country primary location code.
kCGImagePropertyIPTCCountryPrimaryLocationName: The country primary location name.
kCGImagePropertyIPTCOriginalTransmissionReference: The original transmission reference.
kCGImagePropertyIPTCHeadline: The headline.
kCGImagePropertyIPTCCredit: Credit information.
kCGImagePropertyIPTCSource: The source.
kCGImagePropertyIPTCCopyrightNotice: The copyright notice.
kCGImagePropertyIPTCContact: Contact information.
kCGImagePropertyIPTCCaptionAbstract: The caption abstract.
kCGImagePropertyIPTCWriterEditor: The writer or editor.
kCGImagePropertyIPTCImageType: The image type.
kCGImagePropertyIPTCImageOrientation: The image orientation.
kCGImagePropertyIPTCLanguageIdentifier: The language identifier.
kCGImagePropertyIPTCStarRating: The star rating.

Discussion

IPTC constants are metadata elements of the Information Interchange Model (IIM) used to provide information about images. The IIM was developer by the Newspaper Association of America (NAA) and the International Press Telecommunications Council (IPTC).

Declared In

CGImageProperties.h

JFIF Dictionary Keys

Keys for an image that uses JPEG File Interchange Format (JFIF).

const CFStringRef kCGImagePropertyJFIFVersion;
const CFStringRef kCGImagePropertyJFIFXDensity;
const CFStringRef kCGImagePropertyJFIFYDensity;
const CFStringRef kCGImagePropertyJFIFDensityUnit;
const CFStringRef kCGImagePropertyJFIFIsProgressive;

Constants

kCGImagePropertyJFIFVersion: The version.
kCGImagePropertyJFIFXDensity: The x density.
kCGImagePropertyJFIFYDensity: The y density.
kCGImagePropertyJFIFDensityUnit: The density unit.
kCGImagePropertyJFIFIsProgressive: Whether or not the image is progressive.

Declared In

CGImageProperties.h

PNG Dictionary Keys

Keys for an image that uses Portable Network Graphics (PNG) format.

const CFStringRef kCGImagePropertyPNGGamma;
const CFStringRef kCGImagePropertyPNGInterlaceType;
const CFStringRef kCGImagePropertyPNGXPixelsPerMeter;
const CFStringRef kCGImagePropertyPNGYPixelsPerMeter;
const CFStringRef kCGImagePropertyPNGsRGBIntent;
const CFStringRef kCGImagePropertyPNGChromaticities;