1<?php 2 3///////////////////////////////////////////////////////////////// 4/// getID3() by James Heinrich <info@getid3.org> // 5// available at https://github.com/JamesHeinrich/getID3 // 6// or https://www.getid3.org // 7// or http://getid3.sourceforge.net // 8// see readme.txt for more details // 9///////////////////////////////////////////////////////////////// 10// // 11// module.archive.tiff.php // 12// module for analyzing TIFF files // 13// dependencies: NONE // 14// /// 15///////////////////////////////////////////////////////////////// 16 17if (!defined('GETID3_INCLUDEPATH')) { // prevent path-exposing attacks that access modules directly on public webservers 18 exit; 19} 20 21class getid3_tiff extends getid3_handler 22{ 23 /** 24 * @return bool 25 */ 26 public function Analyze() { 27 $info = &$this->getid3->info; 28 29 $this->fseek($info['avdataoffset']); 30 $TIFFheader = $this->fread(4); 31 32 switch (substr($TIFFheader, 0, 2)) { 33 case 'II': 34 $info['tiff']['byte_order'] = 'Intel'; 35 break; 36 case 'MM': 37 $info['tiff']['byte_order'] = 'Motorola'; 38 break; 39 default: 40 $this->error('Invalid TIFF byte order identifier ('.substr($TIFFheader, 0, 2).') at offset '.$info['avdataoffset']); 41 return false; 42 } 43 44 $info['fileformat'] = 'tiff'; 45 $info['video']['dataformat'] = 'tiff'; 46 $info['video']['lossless'] = true; 47 $info['tiff']['ifd'] = array(); 48 $CurrentIFD = array(); 49 50 $FieldTypeByteLength = array(1=>1, 2=>1, 3=>2, 4=>4, 5=>8); 51 52 $nextIFDoffset = $this->TIFFendian2Int($this->fread(4), $info['tiff']['byte_order']); 53 54 while ($nextIFDoffset > 0) { 55 56 $CurrentIFD['offset'] = $nextIFDoffset; 57 58 $this->fseek($info['avdataoffset'] + $nextIFDoffset); 59 $CurrentIFD['fieldcount'] = $this->TIFFendian2Int($this->fread(2), $info['tiff']['byte_order']); 60 61 for ($i = 0; $i < $CurrentIFD['fieldcount']; $i++) { 62 $CurrentIFD['fields'][$i]['raw']['tag'] = $this->TIFFendian2Int($this->fread(2), $info['tiff']['byte_order']); 63 $CurrentIFD['fields'][$i]['raw']['type'] = $this->TIFFendian2Int($this->fread(2), $info['tiff']['byte_order']); 64 $CurrentIFD['fields'][$i]['raw']['length'] = $this->TIFFendian2Int($this->fread(4), $info['tiff']['byte_order']); 65 $CurrentIFD['fields'][$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. 66 $CurrentIFD['fields'][$i]['raw']['tag_name'] = $this->TIFFcommentName($CurrentIFD['fields'][$i]['raw']['tag']); 67 68 switch ($CurrentIFD['fields'][$i]['raw']['type']) { 69 case 1: // BYTE An 8-bit unsigned integer. 70 if ($CurrentIFD['fields'][$i]['raw']['length'] <= 4) { 71 $CurrentIFD['fields'][$i]['value'] = $this->TIFFendian2Int(substr($CurrentIFD['fields'][$i]['raw']['valoff'], 0, 1), $info['tiff']['byte_order']); 72 } else { 73 $CurrentIFD['fields'][$i]['offset'] = $this->TIFFendian2Int($CurrentIFD['fields'][$i]['raw']['valoff'], $info['tiff']['byte_order']); 74 } 75 break; 76 77 case 2: // ASCII 8-bit bytes that store ASCII codes; the last byte must be null. 78 if ($CurrentIFD['fields'][$i]['raw']['length'] <= 4) { 79 $CurrentIFD['fields'][$i]['value'] = substr($CurrentIFD['fields'][$i]['raw']['valoff'], 3); 80 } else { 81 $CurrentIFD['fields'][$i]['offset'] = $this->TIFFendian2Int($CurrentIFD['fields'][$i]['raw']['valoff'], $info['tiff']['byte_order']); 82 } 83 break; 84 85 case 3: // SHORT A 16-bit (2-byte) unsigned integer. 86 if ($CurrentIFD['fields'][$i]['raw']['length'] <= 2) { 87 $CurrentIFD['fields'][$i]['value'] = $this->TIFFendian2Int(substr($CurrentIFD['fields'][$i]['raw']['valoff'], 0, 2), $info['tiff']['byte_order']); 88 } else { 89 $CurrentIFD['fields'][$i]['offset'] = $this->TIFFendian2Int($CurrentIFD['fields'][$i]['raw']['valoff'], $info['tiff']['byte_order']); 90 } 91 break; 92 93 case 4: // LONG A 32-bit (4-byte) unsigned integer. 94 if ($CurrentIFD['fields'][$i]['raw']['length'] <= 4) { 95 $CurrentIFD['fields'][$i]['value'] = $this->TIFFendian2Int($CurrentIFD['fields'][$i]['raw']['valoff'], $info['tiff']['byte_order']); 96 } else { 97 $CurrentIFD['fields'][$i]['offset'] = $this->TIFFendian2Int($CurrentIFD['fields'][$i]['raw']['valoff'], $info['tiff']['byte_order']); 98 } 99 break; 100 101 case 5: // RATIONAL Two LONG_s: the first represents the numerator of a fraction, the second the denominator. 102 case 7: // UNDEFINED An 8-bit byte that may contain anything, depending on the definition of the field. 103 $CurrentIFD['fields'][$i]['offset'] = $this->TIFFendian2Int($CurrentIFD['fields'][$i]['raw']['valoff'], $info['tiff']['byte_order']); 104 break; 105 106 // 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. 107 // In TIFF 6.0, some new field types have been defined: 108 // These new field types are also governed by the byte order (II or MM) in the TIFF header. 109 case 6: // SBYTE An 8-bit signed (twos-complement) integer. 110 case 8: // SSHORT A 16-bit (2-byte) signed (twos-complement) integer. 111 case 9: // SLONG A 32-bit (4-byte) signed (twos-complement) integer. 112 case 10: // SRATIONAL Two SLONGs: the first represents the numerator of a fraction, the second the denominator. 113 case 11: // FLOAT Single precision (4-byte) IEEE format 114 case 12: // DOUBLE Double precision (8-byte) IEEE format 115 default: 116 $this->warning('unhandled IFD field type '.$CurrentIFD['fields'][$i]['raw']['type'].' for IFD entry '.$i); 117 break; 118 } 119 } 120 121 $info['tiff']['ifd'][] = $CurrentIFD; 122 $CurrentIFD = array(); 123 $nextIFDoffset = $this->TIFFendian2Int($this->fread(4), $info['tiff']['byte_order']); 124 125 } 126 127 foreach ($info['tiff']['ifd'] as $IFDid => $IFDarray) { 128 foreach ($IFDarray['fields'] as $key => $fieldarray) { 129 switch ($fieldarray['raw']['tag']) { 130 case 256: // ImageWidth 131 case 257: // ImageLength 132 case 258: // BitsPerSample 133 case 259: // Compression 134 if (!isset($fieldarray['value'])) { 135 $this->fseek($fieldarray['offset']); 136 $info['tiff']['ifd'][$IFDid]['fields'][$key]['raw']['data'] = $this->fread($fieldarray['raw']['length'] * $FieldTypeByteLength[$fieldarray['raw']['type']]); 137 138 } 139 break; 140 141 case 270: // ImageDescription 142 case 271: // Make 143 case 272: // Model 144 case 305: // Software 145 case 306: // DateTime 146 case 315: // Artist 147 case 316: // HostComputer 148 if (isset($fieldarray['value'])) { 149 $info['tiff']['ifd'][$IFDid]['fields'][$key]['raw']['data'] = $fieldarray['value']; 150 } else { 151 $this->fseek($fieldarray['offset']); 152 $info['tiff']['ifd'][$IFDid]['fields'][$key]['raw']['data'] = $this->fread($fieldarray['raw']['length'] * $FieldTypeByteLength[$fieldarray['raw']['type']]); 153 154 } 155 break; 156 case 700: 157 $XMPmagic = '<?xpacket'; 158 $this->fseek($fieldarray['offset']); 159 $xmpkey = (isset($info['tiff']['XMP']) ? count($info['tiff']['XMP']) : 0); 160 $info['tiff']['XMP'][$xmpkey]['raw'] = $this->fread($fieldarray['raw']['length']); 161 if (substr($info['tiff']['XMP'][$xmpkey]['raw'], 0, strlen($XMPmagic)) != $XMPmagic) { 162 $this->warning('did not find expected XMP data at offset '.$fieldarray['offset']); 163 unset($info['tiff']['XMP'][$xmpkey]['raw']); 164 } 165 break; 166 } 167 switch ($fieldarray['raw']['tag']) { 168 case 256: // ImageWidth 169 $info['video']['resolution_x'] = $fieldarray['value']; 170 break; 171 172 case 257: // ImageLength 173 $info['video']['resolution_y'] = $fieldarray['value']; 174 break; 175 176 case 258: // BitsPerSample 177 if (isset($fieldarray['value'])) { 178 $info['video']['bits_per_sample'] = $fieldarray['value']; 179 } else { 180 $info['video']['bits_per_sample'] = 0; 181 for ($i = 0; $i < $fieldarray['raw']['length']; $i++) { 182 $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']); 183 } 184 } 185 break; 186 187 case 259: // Compression 188 $info['video']['codec'] = $this->TIFFcompressionMethod($fieldarray['value']); 189 break; 190 191 case 270: // ImageDescription 192 case 271: // Make 193 case 272: // Model 194 case 305: // Software 195 case 306: // DateTime 196 case 315: // Artist 197 case 316: // HostComputer 198 $TIFFcommentName = strtolower($fieldarray['raw']['tag_name']); 199 if (isset($info['tiff']['comments'][$TIFFcommentName])) { 200 $info['tiff']['comments'][$TIFFcommentName][] = $info['tiff']['ifd'][$IFDid]['fields'][$key]['raw']['data']; 201 } else { 202 $info['tiff']['comments'][$TIFFcommentName] = array($info['tiff']['ifd'][$IFDid]['fields'][$key]['raw']['data']); 203 } 204 break; 205 206 default: 207 break; 208 } 209 } 210 } 211 212 return true; 213 } 214 215 /** 216 * @param string $bytestring 217 * @param string $byteorder 218 * 219 * @return int|float|false 220 */ 221 public function TIFFendian2Int($bytestring, $byteorder) { 222 if ($byteorder == 'Intel') { 223 return getid3_lib::LittleEndian2Int($bytestring); 224 } elseif ($byteorder == 'Motorola') { 225 return getid3_lib::BigEndian2Int($bytestring); 226 } 227 return false; 228 } 229 230 /** 231 * @param int $id 232 * 233 * @return string 234 */ 235 public function TIFFcompressionMethod($id) { 236 // https://en.wikipedia.org/wiki/TIFF#TIFF_Compression_Tag 237 static $TIFFcompressionMethod = array(); 238 if (empty($TIFFcompressionMethod)) { 239 $TIFFcompressionMethod = array( 240 0x0001 => 'Uncompressed', 241 0x0002 => 'Huffman', 242 0x0003 => 'CCITT T.4', 243 0x0004 => 'CCITT T.6', 244 0x0005 => 'LZW', 245 0x0006 => 'JPEG-old', 246 0x0007 => 'JPEG', 247 0x0008 => 'deflate', 248 0x0009 => 'JBIG ITU-T T.85', 249 0x000A => 'JBIG ITU-T T.43', 250 0x7FFE => 'NeXT RLE 2-bit', 251 0x8005 => 'PackBits', 252 0x8029 => 'ThunderScan RLE 4-bit', 253 0x807F => 'RasterPadding', 254 0x8080 => 'RLE-LW', 255 0x8081 => 'RLE-CT', 256 0x8082 => 'RLE-BL', 257 0x80B2 => 'deflate-PK', 258 0x80B3 => 'Kodak-DCS', 259 0x8765 => 'JBIG', 260 0x8798 => 'JPEG2000', 261 0x8799 => 'Nikon NEF', 262 0x879B => 'JBIG2', 263 ); 264 } 265 return (isset($TIFFcompressionMethod[$id]) ? $TIFFcompressionMethod[$id] : 'unknown/invalid ('.$id.')'); 266 } 267 268 /** 269 * @param int $id 270 * 271 * @return string 272 */ 273 public function TIFFcommentName($id) { 274 // https://www.awaresystems.be/imaging/tiff/tifftags.html 275 static $TIFFcommentName = array(); 276 if (empty($TIFFcommentName)) { 277 $TIFFcommentName = array( 278 254 => 'NewSubfileType', 279 255 => 'SubfileType', 280 256 => 'ImageWidth', 281 257 => 'ImageLength', 282 258 => 'BitsPerSample', 283 259 => 'Compression', 284 262 => 'PhotometricInterpretation', 285 263 => 'Threshholding', 286 264 => 'CellWidth', 287 265 => 'CellLength', 288 266 => 'FillOrder', 289 269 => 'DocumentName', 290 270 => 'ImageDescription', 291 271 => 'Make', 292 272 => 'Model', 293 273 => 'StripOffsets', 294 274 => 'Orientation', 295 277 => 'SamplesPerPixel', 296 278 => 'RowsPerStrip', 297 279 => 'StripByteCounts', 298 280 => 'MinSampleValue', 299 281 => 'MaxSampleValue', 300 282 => 'XResolution', 301 283 => 'YResolution', 302 284 => 'PlanarConfiguration', 303 285 => 'PageName', 304 286 => 'XPosition', 305 287 => 'YPosition', 306 288 => 'FreeOffsets', 307 289 => 'FreeByteCounts', 308 290 => 'GrayResponseUnit', 309 291 => 'GrayResponseCurve', 310 292 => 'T4Options', 311 293 => 'T6Options', 312 296 => 'ResolutionUnit', 313 297 => 'PageNumber', 314 301 => 'TransferFunction', 315 305 => 'Software', 316 306 => 'DateTime', 317 315 => 'Artist', 318 316 => 'HostComputer', 319 317 => 'Predictor', 320 318 => 'WhitePoint', 321 319 => 'PrimaryChromaticities', 322 320 => 'ColorMap', 323 321 => 'HalftoneHints', 324 322 => 'TileWidth', 325 323 => 'TileLength', 326 324 => 'TileOffsets', 327 325 => 'TileByteCounts', 328 326 => 'BadFaxLines', 329 327 => 'CleanFaxData', 330 328 => 'ConsecutiveBadFaxLines', 331 330 => 'SubIFDs', 332 332 => 'InkSet', 333 333 => 'InkNames', 334 334 => 'NumberOfInks', 335 336 => 'DotRange', 336 337 => 'TargetPrinter', 337 338 => 'ExtraSamples', 338 339 => 'SampleFormat', 339 340 => 'SMinSampleValue', 340 341 => 'SMaxSampleValue', 341 342 => 'TransferRange', 342 343 => 'ClipPath', 343 344 => 'XClipPathUnits', 344 345 => 'YClipPathUnits', 345 346 => 'Indexed', 346 347 => 'JPEGTables', 347 351 => 'OPIProxy', 348 400 => 'GlobalParametersIFD', 349 401 => 'ProfileType', 350 402 => 'FaxProfile', 351 403 => 'CodingMethods', 352 404 => 'VersionYear', 353 405 => 'ModeNumber', 354 433 => 'Decode', 355 434 => 'DefaultImageColor', 356 512 => 'JPEGProc', 357 513 => 'JPEGInterchangeFormat', 358 514 => 'JPEGInterchangeFormatLngth', 359 515 => 'JPEGRestartInterval', 360 517 => 'JPEGLosslessPredictors', 361 518 => 'JPEGPointTransforms', 362 519 => 'JPEGQTables', 363 520 => 'JPEGDCTables', 364 521 => 'JPEGACTables', 365 529 => 'YCbCrCoefficients', 366 530 => 'YCbCrSubSampling', 367 531 => 'YCbCrPositioning', 368 532 => 'ReferenceBlackWhite', 369 559 => 'StripRowCounts', 370 700 => 'XMP', 371 372 32781 => 'ImageID', 373 33432 => 'Copyright', 374 34732 => 'ImageLayer', 375 376 // Private Tags - https://www.awaresystems.be/imaging/tiff/tifftags/private.html 377 32932 => 'Wang Annotation', // Annotation data, as used in 'Imaging for Windows'. 378 33445 => 'MD FileTag', // Specifies the pixel data format encoding in the Molecular Dynamics GEL file format. 379 33446 => 'MD ScalePixel', // Specifies a scale factor in the Molecular Dynamics GEL file format. 380 33447 => 'MD ColorTable', // Used to specify the conversion from 16bit to 8bit in the Molecular Dynamics GEL file format. 381 33448 => 'MD LabName', // Name of the lab that scanned this file, as used in the Molecular Dynamics GEL file format. 382 33449 => 'MD SampleInfo', // Information about the sample, as used in the Molecular Dynamics GEL file format. 383 33450 => 'MD PrepDate', // Date the sample was prepared, as used in the Molecular Dynamics GEL file format. 384 33451 => 'MD PrepTime', // Time the sample was prepared, as used in the Molecular Dynamics GEL file format. 385 33452 => 'MD FileUnits', // Units for data in this file, as used in the Molecular Dynamics GEL file format. 386 33550 => 'ModelPixelScaleTag', // Used in interchangeable GeoTIFF files. 387 33723 => 'IPTC', // IPTC (International Press Telecommunications Council) metadata. 388 33918 => 'INGR Packet Data Tag', // Intergraph Application specific storage. 389 33919 => 'INGR Flag Registers', // Intergraph Application specific flags. 390 33920 => 'IrasB Transformation Matrix', // Originally part of Intergraph's GeoTIFF tags, but likely understood by IrasB only. 391 33922 => 'ModelTiepointTag', // Originally part of Intergraph's GeoTIFF tags, but now used in interchangeable GeoTIFF files. 392 34264 => 'ModelTransformationTag', // Used in interchangeable GeoTIFF files. 393 34377 => 'Photoshop', // Collection of Photoshop 'Image Resource Blocks'. 394 34665 => 'Exif IFD', // A pointer to the Exif IFD. 395 34675 => 'ICC Profile', // ICC profile data. 396 34735 => 'GeoKeyDirectoryTag', // Used in interchangeable GeoTIFF files. 397 34736 => 'GeoDoubleParamsTag', // Used in interchangeable GeoTIFF files. 398 34737 => 'GeoAsciiParamsTag', // Used in interchangeable GeoTIFF files. 399 34853 => 'GPS IFD', // A pointer to the Exif-related GPS Info IFD. 400 34908 => 'HylaFAX FaxRecvParams', // Used by HylaFAX. 401 34909 => 'HylaFAX FaxSubAddress', // Used by HylaFAX. 402 34910 => 'HylaFAX FaxRecvTime', // Used by HylaFAX. 403 37724 => 'ImageSourceData', // Used by Adobe Photoshop. 404 40965 => 'Interoperability IFD', // A pointer to the Exif-related Interoperability IFD. 405 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. 406 42113 => 'GDAL_NODATA', // Used by the GDAL library, contains an ASCII encoded nodata or background pixel value. 407 50215 => 'Oce Scanjob Description', // Used in the Oce scanning process. 408 50216 => 'Oce Application Selector', // Used in the Oce scanning process. 409 50217 => 'Oce Identification Number', // Used in the Oce scanning process. 410 50218 => 'Oce ImageLogic Characteristics', // Used in the Oce scanning process. 411 50706 => 'DNGVersion', // Used in IFD 0 of DNG files. 412 50707 => 'DNGBackwardVersion', // Used in IFD 0 of DNG files. 413 50708 => 'UniqueCameraModel', // Used in IFD 0 of DNG files. 414 50709 => 'LocalizedCameraModel', // Used in IFD 0 of DNG files. 415 50710 => 'CFAPlaneColor', // Used in Raw IFD of DNG files. 416 50711 => 'CFALayout', // Used in Raw IFD of DNG files. 417 50712 => 'LinearizationTable', // Used in Raw IFD of DNG files. 418 50713 => 'BlackLevelRepeatDim', // Used in Raw IFD of DNG files. 419 50714 => 'BlackLevel', // Used in Raw IFD of DNG files. 420 50715 => 'BlackLevelDeltaH', // Used in Raw IFD of DNG files. 421 50716 => 'BlackLevelDeltaV', // Used in Raw IFD of DNG files. 422 50717 => 'WhiteLevel', // Used in Raw IFD of DNG files. 423 50718 => 'DefaultScale', // Used in Raw IFD of DNG files. 424 50719 => 'DefaultCropOrigin', // Used in Raw IFD of DNG files. 425 50720 => 'DefaultCropSize', // Used in Raw IFD of DNG files. 426 50721 => 'ColorMatrix1', // Used in IFD 0 of DNG files. 427 50722 => 'ColorMatrix2', // Used in IFD 0 of DNG files. 428 50723 => 'CameraCalibration1', // Used in IFD 0 of DNG files. 429 50724 => 'CameraCalibration2', // Used in IFD 0 of DNG files. 430 50725 => 'ReductionMatrix1', // Used in IFD 0 of DNG files. 431 50726 => 'ReductionMatrix2', // Used in IFD 0 of DNG files. 432 50727 => 'AnalogBalance', // Used in IFD 0 of DNG files. 433 50728 => 'AsShotNeutral', // Used in IFD 0 of DNG files. 434 50729 => 'AsShotWhiteXY', // Used in IFD 0 of DNG files. 435 50730 => 'BaselineExposure', // Used in IFD 0 of DNG files. 436 50731 => 'BaselineNoise', // Used in IFD 0 of DNG files. 437 50732 => 'BaselineSharpness', // Used in IFD 0 of DNG files. 438 50733 => 'BayerGreenSplit', // Used in Raw IFD of DNG files. 439 50734 => 'LinearResponseLimit', // Used in IFD 0 of DNG files. 440 50735 => 'CameraSerialNumber', // Used in IFD 0 of DNG files. 441 50736 => 'LensInfo', // Used in IFD 0 of DNG files. 442 50737 => 'ChromaBlurRadius', // Used in Raw IFD of DNG files. 443 50738 => 'AntiAliasStrength', // Used in Raw IFD of DNG files. 444 50740 => 'DNGPrivateData', // Used in IFD 0 of DNG files. 445 50741 => 'MakerNoteSafety', // Used in IFD 0 of DNG files. 446 50778 => 'CalibrationIlluminant1', // Used in IFD 0 of DNG files. 447 50779 => 'CalibrationIlluminant2', // Used in IFD 0 of DNG files. 448 50780 => 'BestQualityScale', // Used in Raw IFD of DNG files. 449 50784 => 'Alias Layer Metadata', // Alias Sketchbook Pro layer usage description. 450 50908 => 'TIFF_RSID', // This private tag is used in a GEOTIFF standard by DGIWG. 451 50909 => 'GEO_METADATA', // This private tag is used in a GEOTIFF standard by DGIWG. 452 453 // EXIF tags - https://www.awaresystems.be/imaging/tiff/tifftags/privateifd/exif.html 454 33434 => 'ExposureTime', // Exposure time, given in seconds. 455 33437 => 'FNumber', // The F number. 456 34850 => 'ExposureProgram', // The class of the program used by the camera to set exposure when the picture is taken. 457 34852 => 'SpectralSensitivity', // Indicates the spectral sensitivity of each channel of the camera used. 458 34855 => 'ISOSpeedRatings', // Indicates the ISO Speed and ISO Latitude of the camera or input device as specified in ISO 12232. 459 34856 => 'OECF', // Indicates the Opto-Electric Conversion Function (OECF) specified in ISO 14524. 460 36864 => 'ExifVersion', // The version of the supported Exif standard. 461 36867 => 'DateTimeOriginal', // The date and time when the original image data was generated. 462 36868 => 'DateTimeDigitized', // The date and time when the image was stored as digital data. 463 37121 => 'ComponentsConfiguration', // Specific to compressed data; specifies the channels and complements PhotometricInterpretation 464 37122 => 'CompressedBitsPerPixel', // Specific to compressed data; states the compressed bits per pixel. 465 37377 => 'ShutterSpeedValue', // Shutter speed. 466 37378 => 'ApertureValue', // The lens aperture. 467 37379 => 'BrightnessValue', // The value of brightness. 468 37380 => 'ExposureBiasValue', // The exposure bias. 469 37381 => 'MaxApertureValue', // The smallest F number of the lens. 470 37382 => 'SubjectDistance', // The distance to the subject, given in meters. 471 37383 => 'MeteringMode', // The metering mode. 472 37384 => 'LightSource', // The kind of light source. 473 37385 => 'Flash', // Indicates the status of flash when the image was shot. 474 37386 => 'FocalLength', // The actual focal length of the lens, in mm. 475 37396 => 'SubjectArea', // Indicates the location and area of the main subject in the overall scene. 476 37500 => 'MakerNote', // Manufacturer specific information. 477 37510 => 'UserComment', // Keywords or comments on the image; complements ImageDescription. 478 37520 => 'SubsecTime', // A tag used to record fractions of seconds for the DateTime tag. 479 37521 => 'SubsecTimeOriginal', // A tag used to record fractions of seconds for the DateTimeOriginal tag. 480 37522 => 'SubsecTimeDigitized', // A tag used to record fractions of seconds for the DateTimeDigitized tag. 481 40960 => 'FlashpixVersion', // The Flashpix format version supported by a FPXR file. 482 40961 => 'ColorSpace', // The color space information tag is always recorded as the color space specifier. 483 40962 => 'PixelXDimension', // Specific to compressed data; the valid width of the meaningful image. 484 40963 => 'PixelYDimension', // Specific to compressed data; the valid height of the meaningful image. 485 40964 => 'RelatedSoundFile', // Used to record the name of an audio file related to the image data. 486 41483 => 'FlashEnergy', // Indicates the strobe energy at the time the image is captured, as measured in Beam Candle Power Seconds 487 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. 488 41486 => 'FocalPlaneXResolution', // Indicates the number of pixels in the image width (X) direction per FocalPlaneResolutionUnit on the camera focal plane. 489 41487 => 'FocalPlaneYResolution', // Indicates the number of pixels in the image height (Y) direction per FocalPlaneResolutionUnit on the camera focal plane. 490 41488 => 'FocalPlaneResolutionUnit', // Indicates the unit for measuring FocalPlaneXResolution and FocalPlaneYResolution. 491 41492 => 'SubjectLocation', // Indicates the location of the main subject in the scene. 492 41493 => 'ExposureIndex', // Indicates the exposure index selected on the camera or input device at the time the image is captured. 493 41495 => 'SensingMethod', // Indicates the image sensor type on the camera or input device. 494 41728 => 'FileSource', // Indicates the image source. 495 41729 => 'SceneType', // Indicates the type of scene. 496 41730 => 'CFAPattern', // Indicates the color filter array (CFA) geometric pattern of the image sensor when a one-chip color area sensor is used. 497 41985 => 'CustomRendered', // Indicates the use of special processing on image data, such as rendering geared to output. 498 41986 => 'ExposureMode', // Indicates the exposure mode set when the image was shot. 499 41987 => 'WhiteBalance', // Indicates the white balance mode set when the image was shot. 500 41988 => 'DigitalZoomRatio', // Indicates the digital zoom ratio when the image was shot. 501 41989 => 'FocalLengthIn35mmFilm', // Indicates the equivalent focal length assuming a 35mm film camera, in mm. 502 41990 => 'SceneCaptureType', // Indicates the type of scene that was shot. 503 41991 => 'GainControl', // Indicates the degree of overall image gain adjustment. 504 41992 => 'Contrast', // Indicates the direction of contrast processing applied by the camera when the image was shot. 505 41993 => 'Saturation', // Indicates the direction of saturation processing applied by the camera when the image was shot. 506 41994 => 'Sharpness', // Indicates the direction of sharpness processing applied by the camera when the image was shot. 507 41995 => 'DeviceSettingDescription', // This tag indicates information on the picture-taking conditions of a particular camera model. 508 41996 => 'SubjectDistanceRange', // Indicates the distance to the subject. 509 42016 => 'ImageUniqueID', // Indicates an identifier assigned uniquely to each image. 510 ); 511 } 512 return (isset($TIFFcommentName[$id]) ? $TIFFcommentName[$id] : 'unknown/invalid ('.$id.')'); 513 } 514 515 516} 517