name : module.graphic.tiff.php <?php ///////////////////////////////////////////////////////////////// /// getID3() by James Heinrich <info@getid3.org> // // available at https://github.com/JamesHeinrich/getID3 // // or https://www.getid3.org // // or http://getid3.sourceforge.net // // see readme.txt for more details // ///////////////////////////////////////////////////////////////// // // // module.archive.tiff.php // // module for analyzing TIFF files // // dependencies: NONE // // /// ///////////////////////////////////////////////////////////////// if (!defined('GETID3_INCLUDEPATH')) { // prevent path-exposing attacks that access modules directly on public webservers exit; } class getid3_tiff extends getid3_handler { /** * @return bool */ public function Analyze() { $info = &$this->getid3->info; $this->fseek($info['avdataoffset']); $TIFFheader = $this->fread(4); switch (substr($TIFFheader, 0, 2)) { case 'II': $info['tiff']['byte_order'] = 'Intel'; break; case 'MM': $info['tiff']['byte_order'] = 'Motorola'; break; default: $this->error('Invalid TIFF byte order identifier ('.substr($TIFFheader, 0, 2).') at offset '.$info['avdataoffset']); return false; } $info['fileformat'] = 'tiff'; $info['video']['dataformat'] = 'tiff'; $info['video']['lossless'] = true; $info['tiff']['ifd'] = array(); $CurrentIFD = array(); $FieldTypeByteLength = array(1=>1, 2=>1, 3=>2, 4=>4, 5=>8); $nextIFDoffset = $this->TIFFendian2Int($this->fread(4), $info['tiff']['byte_order']); while ($nextIFDoffset > 0) { $CurrentIFD['offset'] = $nextIFDoffset; $this->fseek($info['avdataoffset'] + $nextIFDoffset); $CurrentIFD['fieldcount'] = $this->TIFFendian2Int($this->fread(2), $info['tiff']['byte_order']); for ($i = 0; $i < $CurrentIFD['fieldcount']; $i++) { $CurrentIFD['fields'][$i]['raw']['tag'] = $this->TIFFendian2Int($this->fread(2), $info['tiff']['byte_order']); $CurrentIFD['fields'][$i]['raw']['type'] = $this->TIFFendian2Int($this->fread(2), $info['tiff']['byte_order']); $CurrentIFD['fields'][$i]['raw']['length'] = $this->TIFFendian2Int($this->fread(4), $info['tiff']['byte_order']); $CurrentIFD['fields'][$i]['raw']['valoff'] = $this->fread(4); // To save time and space the Value Offset contains the Value instead of pointing to the Value if and only if the Value fits into 4 bytes. If the Value is shorter than 4 bytes, it is left-justified within the 4-byte Value Offset, i.e., stored in the lowernumbered bytes. Whether the Value fits within 4 bytes is determined by the Type and Count of the field. $CurrentIFD['fields'][$i]['raw']['tag_name'] = $this->TIFFcommentName($CurrentIFD['fields'][$i]['raw']['tag']); switch ($CurrentIFD['fields'][$i]['raw']['type']) { case 1: // BYTE An 8-bit unsigned integer. if ($CurrentIFD['fields'][$i]['raw']['length'] <= 4) { $CurrentIFD['fields'][$i]['value'] = $this->TIFFendian2Int(substr($CurrentIFD['fields'][$i]['raw']['valoff'], 0, 1), $info['tiff']['byte_order']); } else { $CurrentIFD['fields'][$i]['offset'] = $this->TIFFendian2Int($CurrentIFD['fields'][$i]['raw']['valoff'], $info['tiff']['byte_order']); } break; case 2: // ASCII 8-bit bytes that store ASCII codes; the last byte must be null. if ($CurrentIFD['fields'][$i]['raw']['length'] <= 4) { $CurrentIFD['fields'][$i]['value'] = substr($CurrentIFD['fields'][$i]['raw']['valoff'], 3); } else { $CurrentIFD['fields'][$i]['offset'] = $this->TIFFendian2Int($CurrentIFD['fields'][$i]['raw']['valoff'], $info['tiff']['byte_order']); } break; case 3: // SHORT A 16-bit (2-byte) unsigned integer. if ($CurrentIFD['fields'][$i]['raw']['length'] <= 2) { $CurrentIFD['fields'][$i]['value'] = $this->TIFFendian2Int(substr($CurrentIFD['fields'][$i]['raw']['valoff'], 0, 2), $info['tiff']['byte_order']); } else { $CurrentIFD['fields'][$i]['offset'] = $this->TIFFendian2Int($CurrentIFD['fields'][$i]['raw']['valoff'], $info['tiff']['byte_order']); } break; case 4: // LONG A 32-bit (4-byte) unsigned integer. if ($CurrentIFD['fields'][$i]['raw']['length'] <= 4) { $CurrentIFD['fields'][$i]['value'] = $this->TIFFendian2Int($CurrentIFD['fields'][$i]['raw']['valoff'], $info['tiff']['byte_order']); } else { $CurrentIFD['fields'][$i]['offset'] = $this->TIFFendian2Int($CurrentIFD['fields'][$i]['raw']['valoff'], $info['tiff']['byte_order']); } break; case 5: // RATIONAL Two LONG_s: the first represents the numerator of a fraction, the second the denominator. case 7: // UNDEFINED An 8-bit byte that may contain anything, depending on the definition of the field. $CurrentIFD['fields'][$i]['offset'] = $this->TIFFendian2Int($CurrentIFD['fields'][$i]['raw']['valoff'], $info['tiff']['byte_order']); break; // Warning: It is possible that other TIFF field types will be added in the future. Readers should skip over fields containing an unexpected field type. // In TIFF 6.0, some new field types have been defined: // These new field types are also governed by the byte order (II or MM) in the TIFF header. case 6: // SBYTE An 8-bit signed (twos-complement) integer. case 8: // SSHORT A 16-bit (2-byte) signed (twos-complement) integer. case 9: // SLONG A 32-bit (4-byte) signed (twos-complement) integer. case 10: // SRATIONAL Two SLONGs: the first represents the numerator of a fraction, the second the denominator. case 11: // FLOAT Single precision (4-byte) IEEE format case 12: // DOUBLE Double precision (8-byte) IEEE format default: $this->warning('unhandled IFD field type '.$CurrentIFD['fields'][$i]['raw']['type'].' for IFD entry '.$i); break; } } $info['tiff']['ifd'][] = $CurrentIFD; $CurrentIFD = array(); $nextIFDoffset = $this->TIFFendian2Int($this->fread(4), $info['tiff']['byte_order']); } foreach ($info['tiff']['ifd'] as $IFDid => $IFDarray) { if(!isset($IFDarray['fields'])) { continue; } foreach ($IFDarray['fields'] as $key => $fieldarray) { switch ($fieldarray['raw']['tag']) { case 256: // ImageWidth case 257: // ImageLength case 258: // BitsPerSample case 259: // Compression if (!isset($fieldarray['value'])) { $this->fseek($fieldarray['offset']); $info['tiff']['ifd'][$IFDid]['fields'][$key]['raw']['data'] = $this->fread($fieldarray['raw']['length'] * $FieldTypeByteLength[$fieldarray['raw']['type']]); } break; case 270: // ImageDescription case 271: // Make case 272: // Model case 305: // Software case 306: // DateTime case 315: // Artist case 316: // HostComputer if (isset($fieldarray['value'])) { $info['tiff']['ifd'][$IFDid]['fields'][$key]['raw']['data'] = $fieldarray['value']; } else { $this->fseek($fieldarray['offset']); $info['tiff']['ifd'][$IFDid]['fields'][$key]['raw']['data'] = $this->fread($fieldarray['raw']['length'] * $FieldTypeByteLength[$fieldarray['raw']['type']]); } break; case 700: $XMPmagic = '<?xpacket'; $this->fseek($fieldarray['offset']); $xmpkey = (isset($info['tiff']['XMP']) ? count($info['tiff']['XMP']) : 0); $info['tiff']['XMP'][$xmpkey]['raw'] = $this->fread($fieldarray['raw']['length']); if (substr($info['tiff']['XMP'][$xmpkey]['raw'], 0, strlen($XMPmagic)) != $XMPmagic) { $this->warning('did not find expected XMP data at offset '.$fieldarray['offset']); unset($info['tiff']['XMP'][$xmpkey]['raw']); } break; } switch ($fieldarray['raw']['tag']) { case 256: // ImageWidth $info['video']['resolution_x'] = $fieldarray['value']; break; case 257: // ImageLength $info['video']['resolution_y'] = $fieldarray['value']; break; case 258: // BitsPerSample if (isset($fieldarray['value'])) { $info['video']['bits_per_sample'] = $fieldarray['value']; } else { $info['video']['bits_per_sample'] = 0; for ($i = 0; $i < $fieldarray['raw']['length']; $i++) { $info['video']['bits_per_sample'] += $this->TIFFendian2Int(substr($info['tiff']['ifd'][$IFDid]['fields'][$key]['raw']['data'], $i * $FieldTypeByteLength[$fieldarray['raw']['type']], $FieldTypeByteLength[$fieldarray['raw']['type']]), $info['tiff']['byte_order']); } } break; case 259: // Compression $info['video']['codec'] = $this->TIFFcompressionMethod($fieldarray['value']); break; case 270: // ImageDescription case 271: // Make case 272: // Model case 305: // Software case 306: // DateTime case 315: // Artist case 316: // HostComputer $TIFFcommentName = strtolower($fieldarray['raw']['tag_name']); if (isset($info['tiff']['comments'][$TIFFcommentName])) { $info['tiff']['comments'][$TIFFcommentName][] = $info['tiff']['ifd'][$IFDid]['fields'][$key]['raw']['data']; } else { $info['tiff']['comments'][$TIFFcommentName] = array($info['tiff']['ifd'][$IFDid]['fields'][$key]['raw']['data']); } break; default: break; } } } return true; } /** * @param string $bytestring * @param string $byteorder * * @return int|float|false */ public function TIFFendian2Int($bytestring, $byteorder) { if ($byteorder == 'Intel') { return getid3_lib::LittleEndian2Int($bytestring); } elseif ($byteorder == 'Motorola') { return getid3_lib::BigEndian2Int($bytestring); } return false; } /** * @param int $id * * @return string */ public function TIFFcompressionMethod($id) { // https://en.wikipedia.org/wiki/TIFF#TIFF_Compression_Tag static $TIFFcompressionMethod = array(); if (empty($TIFFcompressionMethod)) { $TIFFcompressionMethod = array( 0x0001 => 'Uncompressed', 0x0002 => 'Huffman', 0x0003 => 'CCITT T.4', 0x0004 => 'CCITT T.6', 0x0005 => 'LZW', 0x0006 => 'JPEG-old', 0x0007 => 'JPEG', 0x0008 => 'deflate', 0x0009 => 'JBIG ITU-T T.85', 0x000A => 'JBIG ITU-T T.43', 0x7FFE => 'NeXT RLE 2-bit', 0x8005 => 'PackBits', 0x8029 => 'ThunderScan RLE 4-bit', 0x807F => 'RasterPadding', 0x8080 => 'RLE-LW', 0x8081 => 'RLE-CT', 0x8082 => 'RLE-BL', 0x80B2 => 'deflate-PK', 0x80B3 => 'Kodak-DCS', 0x8765 => 'JBIG', 0x8798 => 'JPEG2000', 0x8799 => 'Nikon NEF', 0x879B => 'JBIG2', ); } return (isset($TIFFcompressionMethod[$id]) ? $TIFFcompressionMethod[$id] : 'unknown/invalid ('.$id.')'); } /** * @param int $id * * @return string */ public function TIFFcommentName($id) { // https://www.awaresystems.be/imaging/tiff/tifftags.html static $TIFFcommentName = array(); if (empty($TIFFcommentName)) { $TIFFcommentName = array( 254 => 'NewSubfileType', 255 => 'SubfileType', 256 => 'ImageWidth', 257 => 'ImageLength', 258 => 'BitsPerSample', 259 => 'Compression', 262 => 'PhotometricInterpretation', 263 => 'Threshholding', 264 => 'CellWidth', 265 => 'CellLength', 266 => 'FillOrder', 269 => 'DocumentName', 270 => 'ImageDescription', 271 => 'Make', 272 => 'Model', 273 => 'StripOffsets', 274 => 'Orientation', 277 => 'SamplesPerPixel', 278 => 'RowsPerStrip', 279 => 'StripByteCounts', 280 => 'MinSampleValue', 281 => 'MaxSampleValue', 282 => 'XResolution', 283 => 'YResolution', 284 => 'PlanarConfiguration', 285 => 'PageName', 286 => 'XPosition', 287 => 'YPosition', 288 => 'FreeOffsets', 289 => 'FreeByteCounts', 290 => 'GrayResponseUnit', 291 => 'GrayResponseCurve', 292 => 'T4Options', 293 => 'T6Options', 296 => 'ResolutionUnit', 297 => 'PageNumber', 301 => 'TransferFunction', 305 => 'Software', 306 => 'DateTime', 315 => 'Artist', 316 => 'HostComputer', 317 => 'Predictor', 318 => 'WhitePoint', 319 => 'PrimaryChromaticities', 320 => 'ColorMap', 321 => 'HalftoneHints', 322 => 'TileWidth', 323 => 'TileLength', 324 => 'TileOffsets', 325 => 'TileByteCounts', 326 => 'BadFaxLines', 327 => 'CleanFaxData', 328 => 'ConsecutiveBadFaxLines', 330 => 'SubIFDs', 332 => 'InkSet', 333 => 'InkNames', 334 => 'NumberOfInks', 336 => 'DotRange', 337 => 'TargetPrinter', 338 => 'ExtraSamples', 339 => 'SampleFormat', 340 => 'SMinSampleValue', 341 => 'SMaxSampleValue', 342 => 'TransferRange', 343 => 'ClipPath', 344 => 'XClipPathUnits', 345 => 'YClipPathUnits', 346 => 'Indexed', 347 => 'JPEGTables', 351 => 'OPIProxy', 400 => 'GlobalParametersIFD', 401 => 'ProfileType', 402 => 'FaxProfile', 403 => 'CodingMethods', 404 => 'VersionYear', 405 => 'ModeNumber', 433 => 'Decode', 434 => 'DefaultImageColor', 512 => 'JPEGProc', 513 => 'JPEGInterchangeFormat', 514 => 'JPEGInterchangeFormatLngth', 515 => 'JPEGRestartInterval', 517 => 'JPEGLosslessPredictors', 518 => 'JPEGPointTransforms', 519 => 'JPEGQTables', 520 => 'JPEGDCTables', 521 => 'JPEGACTables', 529 => 'YCbCrCoefficients', 530 => 'YCbCrSubSampling', 531 => 'YCbCrPositioning', 532 => 'ReferenceBlackWhite', 559 => 'StripRowCounts', 700 => 'XMP', 32781 => 'ImageID', 33432 => 'Copyright', 34732 => 'ImageLayer', // Private Tags - https://www.awaresystems.be/imaging/tiff/tifftags/private.html 32932 => 'Wang Annotation', // Annotation data, as used in 'Imaging for Windows'. 33445 => 'MD FileTag', // Specifies the pixel data format encoding in the Molecular Dynamics GEL file format. 33446 => 'MD ScalePixel', // Specifies a scale factor in the Molecular Dynamics GEL file format. 33447 => 'MD ColorTable', // Used to specify the conversion from 16bit to 8bit in the Molecular Dynamics GEL file format. 33448 => 'MD LabName', // Name of the lab that scanned this file, as used in the Molecular Dynamics GEL file format. 33449 => 'MD SampleInfo', // Information about the sample, as used in the Molecular Dynamics GEL file format. 33450 => 'MD PrepDate', // Date the sample was prepared, as used in the Molecular Dynamics GEL file format. 33451 => 'MD PrepTime', // Time the sample was prepared, as used in the Molecular Dynamics GEL file format. 33452 => 'MD FileUnits', // Units for data in this file, as used in the Molecular Dynamics GEL file format. 33550 => 'ModelPixelScaleTag', // Used in interchangeable GeoTIFF files. 33723 => 'IPTC', // IPTC (International Press Telecommunications Council) metadata. 33918 => 'INGR Packet Data Tag', // Intergraph Application specific storage. 33919 => 'INGR Flag Registers', // Intergraph Application specific flags. 33920 => 'IrasB Transformation Matrix', // Originally part of Intergraph's GeoTIFF tags, but likely understood by IrasB only. 33922 => 'ModelTiepointTag', // Originally part of Intergraph's GeoTIFF tags, but now used in interchangeable GeoTIFF files. 34264 => 'ModelTransformationTag', // Used in interchangeable GeoTIFF files. 34377 => 'Photoshop', // Collection of Photoshop 'Image Resource Blocks'. 34665 => 'Exif IFD', // A pointer to the Exif IFD. 34675 => 'ICC Profile', // ICC profile data. 34735 => 'GeoKeyDirectoryTag', // Used in interchangeable GeoTIFF files. 34736 => 'GeoDoubleParamsTag', // Used in interchangeable GeoTIFF files. 34737 => 'GeoAsciiParamsTag', // Used in interchangeable GeoTIFF files. 34853 => 'GPS IFD', // A pointer to the Exif-related GPS Info IFD. 34908 => 'HylaFAX FaxRecvParams', // Used by HylaFAX. 34909 => 'HylaFAX FaxSubAddress', // Used by HylaFAX. 34910 => 'HylaFAX FaxRecvTime', // Used by HylaFAX. 37724 => 'ImageSourceData', // Used by Adobe Photoshop. 40965 => 'Interoperability IFD', // A pointer to the Exif-related Interoperability IFD. 42112 => 'GDAL_METADATA', // Used by the GDAL library, holds an XML list of name=value 'metadata' values about the image as a whole, and about specific samples. 42113 => 'GDAL_NODATA', // Used by the GDAL library, contains an ASCII encoded nodata or background pixel value. 50215 => 'Oce Scanjob Description', // Used in the Oce scanning process. 50216 => 'Oce Application Selector', // Used in the Oce scanning process. 50217 => 'Oce Identification Number', // Used in the Oce scanning process. 50218 => 'Oce ImageLogic Characteristics', // Used in the Oce scanning process. 50706 => 'DNGVersion', // Used in IFD 0 of DNG files. 50707 => 'DNGBackwardVersion', // Used in IFD 0 of DNG files. 50708 => 'UniqueCameraModel', // Used in IFD 0 of DNG files. 50709 => 'LocalizedCameraModel', // Used in IFD 0 of DNG files. 50710 => 'CFAPlaneColor', // Used in Raw IFD of DNG files. 50711 => 'CFALayout', // Used in Raw IFD of DNG files. 50712 => 'LinearizationTable', // Used in Raw IFD of DNG files. 50713 => 'BlackLevelRepeatDim', // Used in Raw IFD of DNG files. 50714 => 'BlackLevel', // Used in Raw IFD of DNG files. 50715 => 'BlackLevelDeltaH', // Used in Raw IFD of DNG files. 50716 => 'BlackLevelDeltaV', // Used in Raw IFD of DNG files. 50717 => 'WhiteLevel', // Used in Raw IFD of DNG files. 50718 => 'DefaultScale', // Used in Raw IFD of DNG files. 50719 => 'DefaultCropOrigin', // Used in Raw IFD of DNG files. 50720 => 'DefaultCropSize', // Used in Raw IFD of DNG files. 50721 => 'ColorMatrix1', // Used in IFD 0 of DNG files. 50722 => 'ColorMatrix2', // Used in IFD 0 of DNG files. 50723 => 'CameraCalibration1', // Used in IFD 0 of DNG files. 50724 => 'CameraCalibration2', // Used in IFD 0 of DNG files. 50725 => 'ReductionMatrix1', // Used in IFD 0 of DNG files. 50726 => 'ReductionMatrix2', // Used in IFD 0 of DNG files. 50727 => 'AnalogBalance', // Used in IFD 0 of DNG files. 50728 => 'AsShotNeutral', // Used in IFD 0 of DNG files. 50729 => 'AsShotWhiteXY', // Used in IFD 0 of DNG files. 50730 => 'BaselineExposure', // Used in IFD 0 of DNG files. 50731 => 'BaselineNoise', // Used in IFD 0 of DNG files. 50732 => 'BaselineSharpness', // Used in IFD 0 of DNG files. 50733 => 'BayerGreenSplit', // Used in Raw IFD of DNG files. 50734 => 'LinearResponseLimit', // Used in IFD 0 of DNG files. 50735 => 'CameraSerialNumber', // Used in IFD 0 of DNG files. 50736 => 'LensInfo', // Used in IFD 0 of DNG files. 50737 => 'ChromaBlurRadius', // Used in Raw IFD of DNG files. 50738 => 'AntiAliasStrength', // Used in Raw IFD of DNG files. 50740 => 'DNGPrivateData', // Used in IFD 0 of DNG files. 50741 => 'MakerNoteSafety', // Used in IFD 0 of DNG files. 50778 => 'CalibrationIlluminant1', // Used in IFD 0 of DNG files. 50779 => 'CalibrationIlluminant2', // Used in IFD 0 of DNG files. 50780 => 'BestQualityScale', // Used in Raw IFD of DNG files. 50784 => 'Alias Layer Metadata', // Alias Sketchbook Pro layer usage description. 50908 => 'TIFF_RSID', // This private tag is used in a GEOTIFF standard by DGIWG. 50909 => 'GEO_METADATA', // This private tag is used in a GEOTIFF standard by DGIWG. // EXIF tags - https://www.awaresystems.be/imaging/tiff/tifftags/privateifd/exif.html 33434 => 'ExposureTime', // Exposure time, given in seconds. 33437 => 'FNumber', // The F number. 34850 => 'ExposureProgram', // The class of the program used by the camera to set exposure when the picture is taken. 34852 => 'SpectralSensitivity', // Indicates the spectral sensitivity of each channel of the camera used. 34855 => 'ISOSpeedRatings', // Indicates the ISO Speed and ISO Latitude of the camera or input device as specified in ISO 12232. 34856 => 'OECF', // Indicates the Opto-Electric Conversion Function (OECF) specified in ISO 14524. 36864 => 'ExifVersion', // The version of the supported Exif standard. 36867 => 'DateTimeOriginal', // The date and time when the original image data was generated. 36868 => 'DateTimeDigitized', // The date and time when the image was stored as digital data. 37121 => 'ComponentsConfiguration', // Specific to compressed data; specifies the channels and complements PhotometricInterpretation 37122 => 'CompressedBitsPerPixel', // Specific to compressed data; states the compressed bits per pixel. 37377 => 'ShutterSpeedValue', // Shutter speed. 37378 => 'ApertureValue', // The lens aperture. 37379 => 'BrightnessValue', // The value of brightness. 37380 => 'ExposureBiasValue', // The exposure bias. 37381 => 'MaxApertureValue', // The smallest F number of the lens. 37382 => 'SubjectDistance', // The distance to the subject, given in meters. 37383 => 'MeteringMode', // The metering mode. 37384 => 'LightSource', // The kind of light source. 37385 => 'Flash', // Indicates the status of flash when the image was shot. 37386 => 'FocalLength', // The actual focal length of the lens, in mm. 37396 => 'SubjectArea', // Indicates the location and area of the main subject in the overall scene. 37500 => 'MakerNote', // Manufacturer specific information. 37510 => 'UserComment', // Keywords or comments on the image; complements ImageDescription. 37520 => 'SubsecTime', // A tag used to record fractions of seconds for the DateTime tag. 37521 => 'SubsecTimeOriginal', // A tag used to record fractions of seconds for the DateTimeOriginal tag. 37522 => 'SubsecTimeDigitized', // A tag used to record fractions of seconds for the DateTimeDigitized tag. 40960 => 'FlashpixVersion', // The Flashpix format version supported by a FPXR file. 40961 => 'ColorSpace', // The color space information tag is always recorded as the color space specifier. 40962 => 'PixelXDimension', // Specific to compressed data; the valid width of the meaningful image. 40963 => 'PixelYDimension', // Specific to compressed data; the valid height of the meaningful image. 40964 => 'RelatedSoundFile', // Used to record the name of an audio file related to the image data. 41483 => 'FlashEnergy', // Indicates the strobe energy at the time the image is captured, as measured in Beam Candle Power Seconds 41484 => 'SpatialFrequencyResponse', // Records the camera or input device spatial frequency table and SFR values in the direction of image width, image height, and diagonal direction, as specified in ISO 12233. 41486 => 'FocalPlaneXResolution', // Indicates the number of pixels in the image width (X) direction per FocalPlaneResolutionUnit on the camera focal plane. 41487 => 'FocalPlaneYResolution', // Indicates the number of pixels in the image height (Y) direction per FocalPlaneResolutionUnit on the camera focal plane. 41488 => 'FocalPlaneResolutionUnit', // Indicates the unit for measuring FocalPlaneXResolution and FocalPlaneYResolution. 41492 => 'SubjectLocation', // Indicates the location of the main subject in the scene. 41493 => 'ExposureIndex', // Indicates the exposure index selected on the camera or input device at the time the image is captured. 41495 => 'SensingMethod', // Indicates the image sensor type on the camera or input device. 41728 => 'FileSource', // Indicates the image source. 41729 => 'SceneType', // Indicates the type of scene. 41730 => 'CFAPattern', // Indicates the color filter array (CFA) geometric pattern of the image sensor when a one-chip color area sensor is used. 41985 => 'CustomRendered', // Indicates the use of special processing on image data, such as rendering geared to output. 41986 => 'ExposureMode', // Indicates the exposure mode set when the image was shot. 41987 => 'WhiteBalance', // Indicates the white balance mode set when the image was shot. 41988 => 'DigitalZoomRatio', // Indicates the digital zoom ratio when the image was shot. 41989 => 'FocalLengthIn35mmFilm', // Indicates the equivalent focal length assuming a 35mm film camera, in mm. 41990 => 'SceneCaptureType', // Indicates the type of scene that was shot. 41991 => 'GainControl', // Indicates the degree of overall image gain adjustment. 41992 => 'Contrast', // Indicates the direction of contrast processing applied by the camera when the image was shot. 41993 => 'Saturation', // Indicates the direction of saturation processing applied by the camera when the image was shot. 41994 => 'Sharpness', // Indicates the direction of sharpness processing applied by the camera when the image was shot. 41995 => 'DeviceSettingDescription', // This tag indicates information on the picture-taking conditions of a particular camera model. 41996 => 'SubjectDistanceRange', // Indicates the distance to the subject. 42016 => 'ImageUniqueID', // Indicates an identifier assigned uniquely to each image. ); } return (isset($TIFFcommentName[$id]) ? $TIFFcommentName[$id] : 'unknown/invalid ('.$id.')'); } }