exiftag

Documentation

Overview

Package exiftag defines constants used for TIFF and Exif files.

Each constant consists of an IFD where it belongs, and a 16-bit tag identifier.

Index

• Constants
• func Desc(name uint32) string
• func Id(name uint32) string

Constants

const (
	DirShift = 20

	Tiff    = 0 << DirShift // tags in IFDs
	Exif    = 1 << DirShift // tags in Exif sub-IFD
	GPS     = 2 << DirShift // tags in GPS sub-IFD
	Interop = 3 << DirShift // tags in interop sub-IFD

	// mask for directory part
	DirMask = 0xFF << DirShift

	// mask of actual tags
	NameMask = 0x000FFFF
)

const (
	// Image width - SHORT or LONG (1)
	ImageWidth = Tiff | 0x0100

	// Image height - SHORT or LONG (1)
	ImageLength = Tiff | 0x0101

	// Number of bits per component - SHORT (3)
	BitsPerSample = Tiff | 0x0102

	// Compression scheme - SHORT (1)
	Compression = Tiff | 0x0103

	// Pixel composition - SHORT (1)
	PhotometricInterpretation = Tiff | 0x0106

	// Orientation of image - SHORT (1)
	Orientation = Tiff | 0x0112

	// Number of components - SHORT (1)
	SamplesPerPixel = Tiff | 0x0115

	// Image data arrangement - SHORT (1)
	PlanarConfiguration = Tiff | 0x011c

	// Subsampling ratio of Y to C - SHORT (2)
	YCbCrSubSampling = Tiff | 0x0212

	// Y and C positioning - SHORT (1)
	YCbCrPositioning = Tiff | 0x0213

	// Image resolution in width direction - RATIONAL (1)
	XResolution = Tiff | 0x011a

	// Image resolution in height direction - RATIONAL (1)
	YResolution = Tiff | 0x011b

	// Unit of X and Y resolution - SHORT (1)
	ResolutionUnit = Tiff | 0x0128

	// Image data location - SHORT or LONG (*S)
	StripOffsets = Tiff | 0x0111

	// Number of rows per strip - SHORT or LONG (1)
	RowsPerStrip = Tiff | 0x0116

	// Bytes per compressed strip - SHORT or LONG (*S)
	StripByteCounts = Tiff | 0x0117

	// Offset to JPEG SOI - LONG (1)
	JPEGInterchangeFormat = Tiff | 0x0201

	// Bytes of JPEG data - LONG (1)
	JPEGInterchangeFormatLength = Tiff | 0x0202

	// Transfer function - SHORT (3*256)
	TransferFunction = Tiff | 0x012d

	// White point chromaticity - RATIONAL (2)
	WhitePoint = Tiff | 0x013e

	// Chromaticities of primaries - RATIONAL (6)
	PrimaryChromaticities = Tiff | 0x013f

	// Color space transformation matrix coefficients - RATIONAL (3)
	YCbCrCoefficients = Tiff | 0x0211

	// Pair of black and white reference values - RATIONAL (6)
	ReferenceBlackWhite = Tiff | 0x0214

	// File change date and time - ASCII (20)
	DateTime = Tiff | 0x0132

	// Image title - ASCII (Any)
	ImageDescription = Tiff | 0x010e

	// Image input equipment manufacturer - ASCII (Any)
	Make = Tiff | 0x010f

	// Image input equipment model - ASCII (Any)
	Model = Tiff | 0x0110

	// Software used - ASCII (Any)
	Software = Tiff | 0x0131

	// Person who created the image - ASCII (Any)
	Artist = Tiff | 0x013b

	// Copyright holder - ASCII (Any)
	Copyright = Tiff | 0x8298

	// Exif version - UNDEFINED (4)
	ExifVersion = Exif | 0x9000

	// Supported Flashpix version - UNDEFINED (4)
	FlashpixVersion = Exif | 0xa000

	// Color space information - SHORT (1)
	ColorSpace = Exif | 0xa001

	// Meaning of each component - UNDEFINED (4)
	ComponentsConfiguration = Exif | 0x9101

	// Image compression mode - RATIONAL (1)
	CompressedBitsPerPixel = Exif | 0x9102

	// Valid image width - SHORT or LONG (1)
	PixelXDimension = Exif | 0xa002

	// Valid image height - SHORT or LONG (1)
	PixelYDimension = Exif | 0xa003

	// Manufacturer notes - UNDEFINED (Any)
	MakerNote = Exif | 0x927c

	// User comments - UNDEFINED (Any)
	UserComment = Exif | 0x9286

	// Related audio file - ASCII (13)
	RelatedSoundFile = Exif | 0xa004

	// Date and time of original data generation - ASCII (20)
	DateTimeOriginal = Exif | 0x9003

	// Date and time of digital data generation - ASCII (20)
	DateTimeDigitized = Exif | 0x9004

	// DateTime subseconds - ASCII (Any)
	SubSecTime = Exif | 0x9290

	// DateTimeOriginal subseconds - ASCII (Any)
	SubSecTimeOriginal = Exif | 0x9291

	// DateTimeDigitized subseconds - ASCII (Any)
	SubSecTimeDigitized = Exif | 0x9292

	// Exposure time - RATIONAL (1)
	ExposureTime = Exif | 0x829a

	// F number - RATIONAL (1)
	FNumber = Exif | 0x829d

	// Exposure program - SHORT (1)
	ExposureProgram = Exif | 0x8822

	// Spectral sensitivity - ASCII (Any)
	SpectralSensitivity = Exif | 0x8824

	// ISO speed rating - SHORT (Any)
	ISOSpeedRatings = Exif | 0x8827

	// Optoelectric conversion factor - UNDEFINED (Any)
	OECF = Exif | 0x8828

	// Shutter speed - SRATIONAL (1)
	ShutterSpeedValue = Exif | 0x9201

	// Aperture - RATIONAL (1)
	ApertureValue = Exif | 0x9202

	// Brightness - SRATIONAL (1)
	BrightnessValue = Exif | 0x9203

	// Exposure bias - SRATIONAL (1)
	ExposureBiasValue = Exif | 0x9204

	// Maximum lens aperture - RATIONAL (1)
	MaxApertureValue = Exif | 0x9205

	// Subject distance - RATIONAL (1)
	SubjectDistance = Exif | 0x9206

	// Metering mode - SHORT (1)
	MeteringMode = Exif | 0x9207

	// Light source - SHORT (1)
	LightSource = Exif | 0x9208

	// Flash - SHORT (1)
	Flash = Exif | 0x9209

	// Lens focal length - RATIONAL (1)
	FocalLength = Exif | 0x920a

	// Subject area - SHORT (2 or 3 or 4)
	SubjectArea = Exif | 0x9214

	// Flash energy - RATIONAL (1)
	FlashEnergy = Exif | 0xa20b

	// Spatial frequency response - UNDEFINED (Any)
	SpatialFrequencyResponse = Exif | 0xa20c

	// Focal plane X resolution - RATIONAL (1)
	FocalPlaneXResolution = Exif | 0xa20e

	// Focal plane Y resolution - RATIONAL (1)
	FocalPlaneYResolution = Exif | 0xa20f

	// Focal plane resolution unit - SHORT (1)
	FocalPlaneResolutionUnit = Exif | 0xa210

	// Subject location - SHORT (2)
	SubjectLocation = Exif | 0xa214

	// Exposure index - RATIONAL (1)
	ExposureIndex = Exif | 0xa215

	// Sensing method - SHORT (1)
	SensingMethod = Exif | 0xa217

	// File source - UNDEFINED (1)
	FileSource = Exif | 0xa300

	// Scene type - UNDEFINED (1)
	SceneType = Exif | 0xa301

	// CFA pattern - UNDEFINED (Any)
	CFAPattern = Exif | 0xa302

	// Custom image processing - SHORT (1)
	CustomRendered = Exif | 0xa401

	// Exposure mode - SHORT (1)
	ExposureMode = Exif | 0xa402

	// White balance - SHORT (1)
	WhiteBalance = Exif | 0xa403

	// Digital zoom ratio - RATIONAL (1)
	DigitalZoomRatio = Exif | 0xa404

	// Focal length in 35 mm film - SHORT (1)
	FocalLengthIn35mmFilm = Exif | 0xa405

	// Scene capture type - SHORT (1)
	SceneCaptureType = Exif | 0xa406

	// Gain control - RATIONAL (1)
	GainControl = Exif | 0xa407

	// Contrast - SHORT (1)
	Contrast = Exif | 0xa408

	// Saturation - SHORT (1)
	Saturation = Exif | 0xa409

	// Sharpness - SHORT (1)
	Sharpness = Exif | 0xa40a

	// Device settings description - UNDEFINED (Any)
	DeviceSettingDescription = Exif | 0xa40b

	// Subject distance range - SHORT (1)
	SubjectDistanceRange = Exif | 0xa40c

	// Unique image ID - ASCII (33)
	ImageUniqueID = Exif | 0xa420

	// GPS tag version - BYTE (4)
	GPSVersionID = GPS | 0x0000

	// North or South Latitude - ASCII (2)
	GPSLatitudeRef = GPS | 0x0001

	// Latitude - RATIONAL (3)
	GPSLatitude = GPS | 0x0002

	// East or West Longitude - ASCII (2)
	GPSLongitudeRef = GPS | 0x0003

	// Longitude - RATIONAL (3)
	GPSLongitude = GPS | 0x0004

	// Altitude reference - BYTE (1)
	GPSAltitudeRef = GPS | 0x0005

	// Altitude - RATIONAL (1)
	GPSAltitude = GPS | 0x0006

	// GPS time (atomic clock) - RATIONAL (3)
	GPSTimeStamp = GPS | 0x0007

	// GPS satellites used for measurement - ASCII (Any)
	GPSSatellites = GPS | 0x0008

	// GPS receiver status - ASCII (2)
	GPSStatus = GPS | 0x0009

	// GPS measurement mode - ASCII (2)
	GPSMeasureMode = GPS | 0x000a

	// Measurement precision - RATIONAL (1)
	GPSDOP = GPS | 0x000b

	// Speed unit - ASCII (2)
	GPSSpeedRef = GPS | 0x000c

	// Speed of GPS receiver - RATIONAL (1)
	GPSSpeed = GPS | 0x000d

	// Reference for direction of movement - ASCII (2)
	GPSTrackRef = GPS | 0x000e

	// Direction of movement - RATIONAL (1)
	GPSTrack = GPS | 0x000f

	// Reference for direction of image - ASCII (2)
	GPSImgDirectionRef = GPS | 0x0010

	// Direction of image - RATIONAL (1)
	GPSImgDirection = GPS | 0x0011

	// Geodetic survey data used - ASCII (Any)
	GPSMapDatum = GPS | 0x0012

	// Reference for latitude of destination - ASCII (2)
	GPSDestLatitudeRef = GPS | 0x0013

	// Latitude of destination - RATIONAL (3)
	GPSDestLatitude = GPS | 0x0014

	// Reference for longitude of destination - ASCII (2)
	GPSDestLongitudeRef = GPS | 0x0015

	// Longitude of destination - RATIONAL (3)
	GPSDestLongitude = GPS | 0x0016

	// Reference for bearing of destination - ASCII (2)
	GPSDestBearingRef = GPS | 0x0017

	// Bearing of destination - RATIONAL (1)
	GPSDestBearing = GPS | 0x0018

	// Reference for distance to destination - ASCII (2)
	GPSDestDistanceRef = GPS | 0x0019

	// Distance to destination - RATIONAL (1)
	GPSDestDistance = GPS | 0x001a

	// Name of GPS processing method - UNDEFINED (Any)
	GPSProcessingMethod = GPS | 0x001b

	// Name of GPS area - UNDEFINED (Any)
	GPSAreaInformation = GPS | 0x001c

	// GPS date - ASCII (11)
	GPSDateStamp = GPS | 0x001d

	// GPS differential correction - SHORT (1)
	GPSDifferential = GPS | 0x001e
)

Functions

func Desc

func Desc(name uint32) string

Desc returns the English string description from the Exif 2.2 specification for the provided name.

func Id

func Id(name uint32) string

Id returns the string identifier from the Exif 2.2 specification for the provided name.