---
title: Image I/O Constants
framework: imageio
role: collectionGroup
role_heading: API Collection
path: imageio/image-i-o-constants
---

# Image I/O Constants

## Topics

### Constants

- [kCGImageAuxiliaryDataInfoColorSpace](imageio/kcgimageauxiliarydatainfocolorspace.md)
- [kCGImageAuxiliaryDataTypeISOGainMap](imageio/kcgimageauxiliarydatatypeisogainmap.md)
- [kCGImagePropertyGroupMonoscopicImageLocation](imageio/kcgimagepropertygroupmonoscopicimagelocation.md)
- [kCGImagePropertyAVISDictionary](imageio/kcgimagepropertyavisdictionary.md)
- [kCGImagePropertyGroupImageBaseline](imageio/kcgimagepropertygroupimagebaseline.md)
- [kCGImagePropertyGroupImageDisparityAdjustment](imageio/kcgimagepropertygroupimagedisparityadjustment.md)
- [kCGImagePropertyGroupImageIndexLeft](imageio/kcgimagepropertygroupimageindexleft.md)
- [kCGImagePropertyGroupImageIndexRight](imageio/kcgimagepropertygroupimageindexright.md)
- [kCGImagePropertyGroupImageIndexMonoscopic](imageio/kcgimagepropertygroupimageindexmonoscopic.md)
- [kCGImagePropertyGroupImageIsAlternateImage](imageio/kcgimagepropertygroupimageisalternateimage.md)
- [kCGImagePropertyGroupImageIsLeftImage](imageio/kcgimagepropertygroupimageisleftimage.md)
- [kCGImagePropertyGroupImageIsRightImage](imageio/kcgimagepropertygroupimageisrightimage.md)
- [kCGImagePropertyGroupImageIsMonoscopicImage](imageio/kcgimagepropertygroupimageismonoscopicimage.md)
- [kCGImagePropertyGroupImageStereoAggressors](imageio/kcgimagepropertygroupimagestereoaggressors.md)
- [kCGImagePropertyGroupImagesAlternate](imageio/kcgimagepropertygroupimagesalternate.md)
- [kCGImagePropertyGroupIndex](imageio/kcgimagepropertygroupindex.md)
- [kCGImagePropertyGroupType](imageio/kcgimagepropertygrouptype.md)
- [kCGImagePropertyGroupTypeAlternate](imageio/kcgimagepropertygrouptypealternate.md)
- [kCGImagePropertyGroupTypeStereoPair](imageio/kcgimagepropertygrouptypestereopair.md)
- [kCGImagePropertyGroups](imageio/kcgimagepropertygroups.md)
- [kCGImagePropertyHEIFDictionary](imageio/kcgimagepropertyheifdictionary.md)
- [kCGImagePropertyImageIndex](imageio/kcgimagepropertyimageindex.md)
- [kCGImagePropertyPNGPixelsAspectRatio](imageio/kcgimagepropertypngpixelsaspectratio.md)
- [kCGImagePropertyPNGTransparency](imageio/kcgimagepropertypngtransparency.md)
- [kCGImagePropertyTIFFXPosition](imageio/kcgimagepropertytiffxposition.md)
- [kCGImagePropertyTIFFYPosition](imageio/kcgimagepropertytiffyposition.md)
- [kCGImageSourceDecodeRequest](imageio/kcgimagesourcedecoderequest.md)
- [kCGImageSourceDecodeRequestOptions](imageio/kcgimagesourcedecoderequestoptions.md)
- [kCGImageSourceDecodeToHDR](imageio/kcgimagesourcedecodetohdr.md)
- [kCGImageSourceDecodeToSDR](imageio/kcgimagesourcedecodetosdr.md)
- [kIIOCameraExtrinsics_CoordinateSystemID](imageio/kiiocameraextrinsics_coordinatesystemid.md)
- [kIIOCameraExtrinsics_Position](imageio/kiiocameraextrinsics_position.md)
- [kIIOCameraExtrinsics_Rotation](imageio/kiiocameraextrinsics_rotation.md)
- [kIIOCameraModelType_GenericPinhole](imageio/kiiocameramodeltype_genericpinhole.md)
- [kIIOCameraModelType_SimplifiedPinhole](imageio/kiiocameramodeltype_simplifiedpinhole.md)
- [kIIOCameraModel_Intrinsics](imageio/kiiocameramodel_intrinsics.md)
- [kIIOCameraModel_ModelType](imageio/kiiocameramodel_modeltype.md)
- [kIIOMetadata_CameraExtrinsicsKey](imageio/kiiometadata_cameraextrinsicskey.md)
- [kIIOMetadata_CameraModelKey](imageio/kiiometadata_cameramodelkey.md)
- [kIIOMonoscopicImageLocation_Center](imageio/kiiomonoscopicimagelocation_center.md)
- [kIIOMonoscopicImageLocation_Left](imageio/kiiomonoscopicimagelocation_left.md)
- [kIIOMonoscopicImageLocation_Right](imageio/kiiomonoscopicimagelocation_right.md)
- [kIIOMonoscopicImageLocation_Unspecified](imageio/kiiomonoscopicimagelocation_unspecified.md)
- [kIIOStereoAggressors_Severity](imageio/kiiostereoaggressors_severity.md)
- [kIIOStereoAggressors_SubTypeURI](imageio/kiiostereoaggressors_subtypeuri.md)
- [kIIOStereoAggressors_Type](imageio/kiiostereoaggressors_type.md)

## See Also

### Reference

- [Image I/O Functions](imageio/image-i-o-functions.md)
- [Image I/O Macros](imageio/image-i-o-macros.md)