# Image I/O Constants ## Topics ### Constants [`kCGImageAuxiliaryDataInfoColorSpace`](/documentation/ImageIO/kCGImageAuxiliaryDataInfoColorSpace) [`kCGImageAuxiliaryDataTypeISOGainMap`](/documentation/ImageIO/kCGImageAuxiliaryDataTypeISOGainMap) [`kCGImagePropertyGroupMonoscopicImageLocation`](/documentation/ImageIO/kCGImagePropertyGroupMonoscopicImageLocation) [`kCGImagePropertyAVISDictionary`](/documentation/ImageIO/kCGImagePropertyAVISDictionary) [`kCGImagePropertyGroupImageBaseline`](/documentation/ImageIO/kCGImagePropertyGroupImageBaseline) [`kCGImagePropertyGroupImageDisparityAdjustment`](/documentation/ImageIO/kCGImagePropertyGroupImageDisparityAdjustment) [`kCGImagePropertyGroupImageIndexLeft`](/documentation/ImageIO/kCGImagePropertyGroupImageIndexLeft) [`kCGImagePropertyGroupImageIndexRight`](/documentation/ImageIO/kCGImagePropertyGroupImageIndexRight) [`kCGImagePropertyGroupImageIndexMonoscopic`](/documentation/ImageIO/kCGImagePropertyGroupImageIndexMonoscopic) [`kCGImagePropertyGroupImageIsAlternateImage`](/documentation/ImageIO/kCGImagePropertyGroupImageIsAlternateImage) [`kCGImagePropertyGroupImageIsLeftImage`](/documentation/ImageIO/kCGImagePropertyGroupImageIsLeftImage) [`kCGImagePropertyGroupImageIsRightImage`](/documentation/ImageIO/kCGImagePropertyGroupImageIsRightImage) [`kCGImagePropertyGroupImageIsMonoscopicImage`](/documentation/ImageIO/kCGImagePropertyGroupImageIsMonoscopicImage) [`kCGImagePropertyGroupImageStereoAggressors`](/documentation/ImageIO/kCGImagePropertyGroupImageStereoAggressors) [`kCGImagePropertyGroupImagesAlternate`](/documentation/ImageIO/kCGImagePropertyGroupImagesAlternate) [`kCGImagePropertyGroupIndex`](/documentation/ImageIO/kCGImagePropertyGroupIndex) [`kCGImagePropertyGroupType`](/documentation/ImageIO/kCGImagePropertyGroupType) [`kCGImagePropertyGroupTypeAlternate`](/documentation/ImageIO/kCGImagePropertyGroupTypeAlternate) [`kCGImagePropertyGroupTypeStereoPair`](/documentation/ImageIO/kCGImagePropertyGroupTypeStereoPair) [`kCGImagePropertyGroups`](/documentation/ImageIO/kCGImagePropertyGroups) [`kCGImagePropertyHEIFDictionary`](/documentation/ImageIO/kCGImagePropertyHEIFDictionary) [`kCGImagePropertyImageIndex`](/documentation/ImageIO/kCGImagePropertyImageIndex) [`kCGImagePropertyPNGPixelsAspectRatio`](/documentation/ImageIO/kCGImagePropertyPNGPixelsAspectRatio) [`kCGImagePropertyPNGTransparency`](/documentation/ImageIO/kCGImagePropertyPNGTransparency) [`kCGImagePropertyTIFFXPosition`](/documentation/ImageIO/kCGImagePropertyTIFFXPosition) [`kCGImagePropertyTIFFYPosition`](/documentation/ImageIO/kCGImagePropertyTIFFYPosition) [`kCGImageSourceDecodeRequest`](/documentation/ImageIO/kCGImageSourceDecodeRequest) [`kCGImageSourceDecodeRequestOptions`](/documentation/ImageIO/kCGImageSourceDecodeRequestOptions) [`kCGImageSourceDecodeToHDR`](/documentation/ImageIO/kCGImageSourceDecodeToHDR) [`kCGImageSourceDecodeToSDR`](/documentation/ImageIO/kCGImageSourceDecodeToSDR) [`kIIOCameraExtrinsics_CoordinateSystemID`](/documentation/ImageIO/kIIOCameraExtrinsics_CoordinateSystemID) [`kIIOCameraExtrinsics_Position`](/documentation/ImageIO/kIIOCameraExtrinsics_Position) [`kIIOCameraExtrinsics_Rotation`](/documentation/ImageIO/kIIOCameraExtrinsics_Rotation) [`kIIOCameraModelType_GenericPinhole`](/documentation/ImageIO/kIIOCameraModelType_GenericPinhole) [`kIIOCameraModelType_SimplifiedPinhole`](/documentation/ImageIO/kIIOCameraModelType_SimplifiedPinhole) [`kIIOCameraModel_Intrinsics`](/documentation/ImageIO/kIIOCameraModel_Intrinsics) [`kIIOCameraModel_ModelType`](/documentation/ImageIO/kIIOCameraModel_ModelType) [`kIIOMetadata_CameraExtrinsicsKey`](/documentation/ImageIO/kIIOMetadata_CameraExtrinsicsKey) [`kIIOMetadata_CameraModelKey`](/documentation/ImageIO/kIIOMetadata_CameraModelKey) [`kIIOMonoscopicImageLocation_Center`](/documentation/ImageIO/kIIOMonoscopicImageLocation_Center) [`kIIOMonoscopicImageLocation_Left`](/documentation/ImageIO/kIIOMonoscopicImageLocation_Left) [`kIIOMonoscopicImageLocation_Right`](/documentation/ImageIO/kIIOMonoscopicImageLocation_Right) [`kIIOMonoscopicImageLocation_Unspecified`](/documentation/ImageIO/kIIOMonoscopicImageLocation_Unspecified) [`kIIOStereoAggressors_Severity`](/documentation/ImageIO/kIIOStereoAggressors_Severity) [`kIIOStereoAggressors_SubTypeURI`](/documentation/ImageIO/kIIOStereoAggressors_SubTypeURI) [`kIIOStereoAggressors_Type`](/documentation/ImageIO/kIIOStereoAggressors_Type) --- Copyright © 2026 Apple Inc. All rights reserved. | [Terms of Use](https://www.apple.com/legal/internet-services/terms/site.html) | [Privacy Policy](https://www.apple.com/privacy/privacy-policy)