TiffTags.py

#
# The Python Imaging Library.
# $Id$
#
# TIFF tags
#
# This module provides clear-text names for various well-known
# TIFF tags.  the TIFF codec works just fine without it.
#
# Copyright (c) Secret Labs AB 1999.
#
# See the README file for information on usage and redistribution.
#

##
# This module provides constants and clear-text names for various
# well-known TIFF tags.
##

from collections import namedtuple


class TagInfo(namedtuple("_TagInfo", "value name type length enum")):
    __slots__ = []

    def __new__(cls, value=None, name="unknown", type=None, length=None, enum=None):
        return super().__new__(cls, value, name, type, length, enum or {})

    def cvt_enum(self, value):
        # Using get will call hash(value), which can be expensive
        # for some types (e.g. Fraction). Since self.enum is rarely
        # used, it's usually better to test it first.
        return self.enum.get(value, value) if self.enum else value


def lookup(tag, group=None):
    """
    :param tag: Integer tag number
    :returns: Taginfo namedtuple, From the TAGS_V2 info if possible,
        otherwise just populating the value and name from TAGS.
        If the tag is not recognized, "unknown" is returned for the name

    """

    if group is not None:
        info = TAGS_V2_GROUPS[group].get(tag) if group in TAGS_V2_GROUPS else None
    else:
        info = TAGS_V2.get(tag)
    return info or TagInfo(tag, TAGS.get(tag, "unknown"))


##
# Map tag numbers to tag info.
#
#  id: (Name, Type, Length, enum_values)
#
# The length here differs from the length in the tiff spec.  For
# numbers, the tiff spec is for the number of fields returned. We
# agree here.  For string-like types, the tiff spec uses the length of
# field in bytes.  In Pillow, we are using the number of expected
# fields, in general 1 for string-like types.


BYTE = 1
ASCII = 2
SHORT = 3
LONG = 4
RATIONAL = 5
SIGNED_BYTE = 6
UNDEFINED = 7
SIGNED_SHORT = 8
SIGNED_LONG = 9
SIGNED_RATIONAL = 10
FLOAT = 11
DOUBLE = 12
IFD = 13
LONG8 = 16

TAGS_V2 = {
    254: ("NewSubfileType", LONG, 1),
    255: ("SubfileType", SHORT, 1),
    256: ("ImageWidth", LONG, 1),
    257: ("ImageLength", LONG, 1),
    258: ("BitsPerSample", SHORT, 0),
    259: (
        "Compression",
        SHORT,
        1,
        {
            "Uncompressed": 1,
            "CCITT 1d": 2,
            "Group 3 Fax": 3,
            "Group 4 Fax": 4,
            "LZW": 5,
            "JPEG": 6,
            "PackBits": 32773,
        },
    ),
    262: (
        "PhotometricInterpretation",
        SHORT,
        1,
        {
            "WhiteIsZero": 0,
            "BlackIsZero": 1,
            "RGB": 2,
            "RGB Palette": 3,
            "Transparency Mask": 4,
            "CMYK": 5,
            "YCbCr": 6,
            "CieLAB": 8,
            "CFA": 32803,  # TIFF/EP, Adobe DNG
            "LinearRaw": 32892,  # Adobe DNG
        },
    ),
    263: ("Threshholding", SHORT, 1),
    264: ("CellWidth", SHORT, 1),
    265: ("CellLength", SHORT, 1),
    266: ("FillOrder", SHORT, 1),
    269: ("DocumentName", ASCII, 1),
    270: ("ImageDescription", ASCII, 1),
    271: ("Make", ASCII, 1),
    272: ("Model", ASCII, 1),
    273: ("StripOffsets", LONG, 0),
    274: ("Orientation", SHORT, 1),
    277: ("SamplesPerPixel", SHORT, 1),
    278: ("RowsPerStrip", LONG, 1),
    279: ("StripByteCounts", LONG, 0),
    280: ("MinSampleValue", SHORT, 0),
    281: ("MaxSampleValue", SHORT, 0),
    282: ("XResolution", RATIONAL, 1),
    283: ("YResolution", RATIONAL, 1),
    284: ("PlanarConfiguration", SHORT, 1, {"Contiguous": 1, "Separate": 2}),
    285: ("PageName", ASCII, 1),
    286: ("XPosition", RATIONAL, 1),
    287: ("YPosition", RATIONAL, 1),
    288: ("FreeOffsets", LONG, 1),
    289: ("FreeByteCounts", LONG, 1),
    290: ("GrayResponseUnit", SHORT, 1),
    291: ("GrayResponseCurve", SHORT, 0),
    292: ("T4Options", LONG, 1),
    293: ("T6Options", LONG, 1),
    296: ("ResolutionUnit", SHORT, 1, {"none": 1, "inch": 2, "cm": 3}),
    297: ("PageNumber", SHORT, 2),
    301: ("TransferFunction", SHORT, 0),
    305: ("Software", ASCII, 1),
    306: ("DateTime", ASCII, 1),
    315: ("Artist", ASCII, 1),
    316: ("HostComputer", ASCII, 1),
    317: ("Predictor", SHORT, 1, {"none": 1, "Horizontal Differencing": 2}),
    318: ("WhitePoint", RATIONAL, 2),
    319: ("PrimaryChromaticities", RATIONAL, 6),
    320: ("ColorMap", SHORT, 0),
    321: ("HalftoneHints", SHORT, 2),
    322: ("TileWidth", LONG, 1),
    323: ("TileLength", LONG, 1),
    324: ("TileOffsets", LONG, 0),
    325: ("TileByteCounts", LONG, 0),
    332: ("InkSet", SHORT, 1),
    333: ("InkNames", ASCII, 1),
    334: ("NumberOfInks", SHORT, 1),
    336: ("DotRange", SHORT, 0),
    337: ("TargetPrinter", ASCII, 1),
    338: ("ExtraSamples", SHORT, 0),
    339: ("SampleFormat", SHORT, 0),
    340: ("SMinSampleValue", DOUBLE, 0),
    341: ("SMaxSampleValue", DOUBLE, 0),
    342: ("TransferRange", SHORT, 6),
    347: ("JPEGTables", UNDEFINED, 1),
    # obsolete JPEG tags
    512: ("JPEGProc", SHORT, 1),
    513: ("JPEGInterchangeFormat", LONG, 1),
    514: ("JPEGInterchangeFormatLength", LONG, 1),
    515: ("JPEGRestartInterval", SHORT, 1),
    517: ("JPEGLosslessPredictors", SHORT, 0),
    518: ("JPEGPointTransforms", SHORT, 0),
    519: ("JPEGQTables", LONG, 0),
    520: ("JPEGDCTables", LONG, 0),
    521: ("JPEGACTables", LONG, 0),
    529: ("YCbCrCoefficients", RATIONAL, 3),
    530: ("YCbCrSubSampling", SHORT, 2),
    531: ("YCbCrPositioning", SHORT, 1),
    532: ("ReferenceBlackWhite", RATIONAL, 6),
    700: ("XMP", BYTE, 0),
    33432: ("Copyright", ASCII, 1),
    33723: ("IptcNaaInfo", UNDEFINED, 1),
    34377: ("PhotoshopInfo", BYTE, 0),
    # FIXME add more tags here
    34665: ("ExifIFD", LONG, 1),
    34675: ("ICCProfile", UNDEFINED, 1),
    34853: ("GPSInfoIFD", LONG, 1),
    36864: ("ExifVersion", UNDEFINED, 1),
    40965: ("InteroperabilityIFD", LONG, 1),
    41730: ("CFAPattern", UNDEFINED, 1),
    # MPInfo
    45056: ("MPFVersion", UNDEFINED, 1),
    45057: ("NumberOfImages", LONG, 1),
    45058: ("MPEntry", UNDEFINED, 1),
    45059: ("ImageUIDList", UNDEFINED, 0),  # UNDONE, check
    45060: ("TotalFrames", LONG, 1),
    45313: ("MPIndividualNum", LONG, 1),
    45569: ("PanOrientation", LONG, 1),
    45570: ("PanOverlap_H", RATIONAL, 1),
    45571: ("PanOverlap_V", RATIONAL, 1),
    45572: ("BaseViewpointNum", LONG, 1),
    45573: ("ConvergenceAngle", SIGNED_RATIONAL, 1),
    45574: ("BaselineLength", RATIONAL, 1),
    45575: ("VerticalDivergence", SIGNED_RATIONAL, 1),
    45576: ("AxisDistance_X", SIGNED_RATIONAL, 1),
    45577: ("AxisDistance_Y", SIGNED_RATIONAL, 1),
    45578: ("AxisDistance_Z", SIGNED_RATIONAL, 1),
    45579: ("YawAngle", SIGNED_RATIONAL, 1),
    45580: ("PitchAngle", SIGNED_RATIONAL, 1),
    45581: ("RollAngle", SIGNED_RATIONAL, 1),
    40960: ("FlashPixVersion", UNDEFINED, 1),
    50741: ("MakerNoteSafety", SHORT, 1, {"Unsafe": 0, "Safe": 1}),
    50780: ("BestQualityScale", RATIONAL, 1),
    50838: ("ImageJMetaDataByteCounts", LONG, 0),  # Can be more than one
    50839: ("ImageJMetaData", UNDEFINED, 1),  # see Issue #2006
}
TAGS_V2_GROUPS = {
    # ExifIFD
    34665: {
        36864: ("ExifVersion", UNDEFINED, 1),
        40960: ("FlashPixVersion", UNDEFINED, 1),
        40965: ("InteroperabilityIFD", LONG, 1),
        41730: ("CFAPattern", UNDEFINED, 1),
    },
    # GPSInfoIFD
    34853: {},
    # InteroperabilityIFD
    40965: {1: ("InteropIndex", ASCII, 1), 2: ("InteropVersion", UNDEFINED, 1)},
}

# Legacy Tags structure
# these tags aren't included above, but were in the previous versions
TAGS = {
    347: "JPEGTables",
    700: "XMP",
    # Additional Exif Info
    32932: "Wang Annotation",
    33434: "ExposureTime",
    33437: "FNumber",
    33445: "MD FileTag",
    33446: "MD ScalePixel",
    33447: "MD ColorTable",
    33448: "MD LabName",
    33449: "MD SampleInfo",
    33450: "MD PrepDate",
    33451: "MD PrepTime",
    33452: "MD FileUnits",
    33550: "ModelPixelScaleTag",
    33723: "IptcNaaInfo",
    33918: "INGR Packet Data Tag",
    33919: "INGR Flag Registers",
    33920: "IrasB Transformation Matrix",
    33922: "ModelTiepointTag",
    34264: "ModelTransformationTag",
    34377: "PhotoshopInfo",
    34735: "GeoKeyDirectoryTag",
    34736: "GeoDoubleParamsTag",
    34737: "GeoAsciiParamsTag",
    34850: "ExposureProgram",
    34852: "SpectralSensitivity",
    34855: "ISOSpeedRatings",
    34856: "OECF",
    34864: "SensitivityType",
    34865: "StandardOutputSensitivity",
    34866: "RecommendedExposureIndex",
    34867: "ISOSpeed",
    34868: "ISOSpeedLatitudeyyy",
    34869: "ISOSpeedLatitudezzz",
    34908: "HylaFAX FaxRecvParams",
    34909: "HylaFAX FaxSubAddress",
    34910: "HylaFAX FaxRecvTime",
    36864: "ExifVersion",
    36867: "DateTimeOriginal",
    36868: "DateTImeDigitized",
    37121: "ComponentsConfiguration",
    37122: "CompressedBitsPerPixel",
    37724: "ImageSourceData",
    37377: "ShutterSpeedValue",
    37378: "ApertureValue",
    37379: "BrightnessValue",
    37380: "ExposureBiasValue",
    37381: "MaxApertureValue",
    37382: "SubjectDistance",
    37383: "MeteringMode",
    37384: "LightSource",
    37385: "Flash",
    37386: "FocalLength",
    37396: "SubjectArea",
    37500: "MakerNote",
    37510: "UserComment",
    37520: "SubSec",
    37521: "SubSecTimeOriginal",
    37522: "SubsecTimeDigitized",
    40960: "FlashPixVersion",
    40961: "ColorSpace",
    40962: "PixelXDimension",
    40963: "PixelYDimension",
    40964: "RelatedSoundFile",
    40965: "InteroperabilityIFD",
    41483: "FlashEnergy",
    41484: "SpatialFrequencyResponse",
    41486: "FocalPlaneXResolution",
    41487: "FocalPlaneYResolution",
    41488: "FocalPlaneResolutionUnit",
    41492: "SubjectLocation",
    41493: "ExposureIndex",
    41495: "SensingMethod",
    41728: "FileSource",
    41729: "SceneType",
    41730: "CFAPattern",
    41985: "CustomRendered",
    41986: "ExposureMode",
    41987: "WhiteBalance",
    41988: "DigitalZoomRatio",
    41989: "FocalLengthIn35mmFilm",
    41990: "SceneCaptureType",
    41991: "GainControl",
    41992: "Contrast",
    41993: "Saturation",
    41994: "Sharpness",
    41995: "DeviceSettingDescription",
    41996: "SubjectDistanceRange",
    42016: "ImageUniqueID",
    42032: "CameraOwnerName",
    42033: "BodySerialNumber",
    42034: "LensSpecification",
    42035: "LensMake",
    42036: "LensModel",
    42037: "LensSerialNumber",
    42112: "GDAL_METADATA",
    42113: "GDAL_NODATA",
    42240: "Gamma",
    50215: "Oce Scanjob Description",
    50216: "Oce Application Selector",
    50217: "Oce Identification Number",
    50218: "Oce ImageLogic Characteristics",
    # Adobe DNG
    50706: "DNGVersion",
    50707: "DNGBackwardVersion",
    50708: "UniqueCameraModel",
    50709: "LocalizedCameraModel",
    50710: "CFAPlaneColor",
    50711: "CFALayout",
    50712: "LinearizationTable",
    50713: "BlackLevelRepeatDim",
    50714: "BlackLevel",
    50715: "BlackLevelDeltaH",
    50716: "BlackLevelDeltaV",
    50717: "WhiteLevel",
    50718: "DefaultScale",
    50719: "DefaultCropOrigin",
    50720: "DefaultCropSize",
    50721: "ColorMatrix1",
    50722: "ColorMatrix2",
    50723: "CameraCalibration1",
    50724: "CameraCalibration2",
    50725: "ReductionMatrix1",
    50726: "ReductionMatrix2",
    50727: "AnalogBalance",
    50728: "AsShotNeutral",
    50729: "AsShotWhiteXY",
    50730: "BaselineExposure",
    50731: "BaselineNoise",
    50732: "BaselineSharpness",
    50733: "BayerGreenSplit",
    50734: "LinearResponseLimit",
    50735: "CameraSerialNumber",
    50736: "LensInfo",
    50737: "ChromaBlurRadius",
    50738: "AntiAliasStrength",
    50740: "DNGPrivateData",
    50778: "CalibrationIlluminant1",
    50779: "CalibrationIlluminant2",
    50784: "Alias Layer Metadata",
}


def _populate():
    for k, v in TAGS_V2.items():
        # Populate legacy structure.
        TAGS[k] = v[0]
        if len(v) == 4:
            for sk, sv in v[3].items():
                TAGS[(k, sv)] = sk

        TAGS_V2[k] = TagInfo(k, *v)

    for group, tags in TAGS_V2_GROUPS.items():
        for k, v in tags.items():
            tags[k] = TagInfo(k, *v)


_populate()
##
# Map type numbers to type names -- defined in ImageFileDirectory.

TYPES = {}

# was:
# TYPES = {
#     1: "byte",
#     2: "ascii",
#     3: "short",
#     4: "long",
#     5: "rational",
#     6: "signed byte",
#     7: "undefined",
#     8: "signed short",
#     9: "signed long",
#     10: "signed rational",
#     11: "float",
#     12: "double",
# }

#
# These tags are handled by default in libtiff, without
# adding to the custom dictionary. From tif_dir.c, searching for
# case TIFFTAG in the _TIFFVSetField function:
# Line: item.
# 148: case TIFFTAG_SUBFILETYPE:
# 151: case TIFFTAG_IMAGEWIDTH:
# 154: case TIFFTAG_IMAGELENGTH:
# 157: case TIFFTAG_BITSPERSAMPLE:
# 181: case TIFFTAG_COMPRESSION:
# 202: case TIFFTAG_PHOTOMETRIC:
# 205: case TIFFTAG_THRESHHOLDING:
# 208: case TIFFTAG_FILLORDER:
# 214: case TIFFTAG_ORIENTATION:
# 221: case TIFFTAG_SAMPLESPERPIXEL:
# 228: case TIFFTAG_ROWSPERSTRIP:
# 238: case TIFFTAG_MINSAMPLEVALUE:
# 241: case TIFFTAG_MAXSAMPLEVALUE:
# 244: case TIFFTAG_SMINSAMPLEVALUE:
# 247: case TIFFTAG_SMAXSAMPLEVALUE:
# 250: case TIFFTAG_XRESOLUTION:
# 256: case TIFFTAG_YRESOLUTION:
# 262: case TIFFTAG_PLANARCONFIG:
# 268: case TIFFTAG_XPOSITION:
# 271: case TIFFTAG_YPOSITION:
# 274: case TIFFTAG_RESOLUTIONUNIT:
# 280: case TIFFTAG_PAGENUMBER:
# 284: case TIFFTAG_HALFTONEHINTS:
# 288: case TIFFTAG_COLORMAP:
# 294: case TIFFTAG_EXTRASAMPLES:
# 298: case TIFFTAG_MATTEING:
# 305: case TIFFTAG_TILEWIDTH:
# 316: case TIFFTAG_TILELENGTH:
# 327: case TIFFTAG_TILEDEPTH:
# 333: case TIFFTAG_DATATYPE:
# 344: case TIFFTAG_SAMPLEFORMAT:
# 361: case TIFFTAG_IMAGEDEPTH:
# 364: case TIFFTAG_SUBIFD:
# 376: case TIFFTAG_YCBCRPOSITIONING:
# 379: case TIFFTAG_YCBCRSUBSAMPLING:
# 383: case TIFFTAG_TRANSFERFUNCTION:
# 389: case TIFFTAG_REFERENCEBLACKWHITE:
# 393: case TIFFTAG_INKNAMES:

# Following pseudo-tags are also handled by default in libtiff:
# TIFFTAG_JPEGQUALITY 65537

# some of these are not in our TAGS_V2 dict and were included from tiff.h

# This list also exists in encode.c
LIBTIFF_CORE = {
    255,
    256,
    257,
    258,
    259,
    262,
    263,
    266,
    274,
    277,
    278,
    280,
    281,
    340,
    341,
    282,
    283,
    284,
    286,
    287,
    296,
    297,
    321,
    320,
    338,
    32995,
    322,
    323,
    32998,
    32996,
    339,
    32997,
    330,
    531,
    530,
    301,
    532,
    333,
    # as above
    269,  # this has been in our tests forever, and works
    65537,
}

LIBTIFF_CORE.remove(255)  # We don't have support for subfiletypes
LIBTIFF_CORE.remove(322)  # We don't have support for writing tiled images with libtiff
LIBTIFF_CORE.remove(323)  # Tiled images
LIBTIFF_CORE.remove(333)  # Ink Names either

# Note to advanced users: There may be combinations of these
# parameters and values that when added properly, will work and
# produce valid tiff images that may work in your application.
# It is safe to add and remove tags from this set from Pillow's point
# of view so long as you test against libtiff.