Author Information on EOS550D CR2-Files

Hello,

i have started to use libraw for raw image data processing of CR2-files from the Canon EOS 550D.
Doing:

LibRaw iProcessor;
iProcessor.open_file(fullfilename);
iProcessor.unpack()

I cannot get the author information from:

iProcessor.imgdata.other.artist

Its just an empty string there. I have checked the corresponding CR2-file and my name is in there - clearly readable as ASCII text. Why i cannot get it using your library??

Greetings,
Lops

Forums: 

LibRaw extracts artist from

LibRaw extracts artist from Canon's makernotes tag #9 and IFD tag #315. Could you please provide EXIF data dump of your file?

-- Alex Tutubalin

Here is a dump I extracted

Here is a dump I extracted using exifprobe (linux). The entry Exif.Canon.OwnerName seems to be empty. The author information appears somewhere else, but see by yourself:

File Name = IMG_2015.CR2
File Type = TIFF:II
File Size = 19860267
@000000000=0 : TIFF(II=0x4949) magic=0x002a='*\0' ifd offset = 0x10/16
@0x0000010=16 : 16 entries starting at file offset 0x12=18
@0x0000012=18 : <0x0100= 256> ImageWidth [3 =SHORT 1] = 5184
@0x000001e=30 : <0x0101= 257> ImageLength [3 =SHORT 1] = 3456
@0x000002a=42 : <0x0102= 258> BitsPerSample [3 =SHORT 3] = @0xd6=214
@0x0000036=54 : <0x0103= 259> Compression [3 =SHORT 1] = 6 = 'Exif/old JPEG'
@0x0000042=66 : <0x010f= 271> Make [2 =ASCII 6] = @0xdc=220
@0x000004e=78 : <0x0110= 272> Model [2 =ASCII 15] = @0xe2=226
@0x000005a=90 : <0x0111= 273> StripOffsets [4 =LONG 1] = @52244
@0x0000066=102 : <0x0112= 274> Orientation [3 =SHORT 1] = 1 = '0,0 is top left'
@0x0000072=114 : <0x0117= 279> StripByteCounts [4 =LONG 1] = 960304
@0x000007e=126 : <0x011a= 282> XResolution [5 =RATIONAL 1] = @0x102=258
@0x000008a=138 : <0x011b= 283> YResolution [5 =RATIONAL 1] = @0x10a=266
@0x0000096=150 : <0x0128= 296> ResolutionUnit [3 =SHORT 1] = 2 = 'pixels per inch'
@0x00000a2=162 : <0x0132= 306> DateTime [2 =ASCII 20] = @0x112=274
@0x00000ae=174 : <0x013b= 315> Artist [2 =ASCII 5] = @0x126=294
@0x00000ba=186 : <0x8298=33432> Copyright [2 =ASCII 8] = @0x166=358
@0x00000c6=198 : <0x8769=34665> ExifIFDPointer [4 =LONG 1] = @0x1a6=422
@0x00000d2=210 : **** next IFD offset 46124(+ 0 = 0xb42c/46124)
@0x00000d6=214 : ============= VALUES, IFD 0 ============
@0x00000d6=214 : BitsPerSample = 8,8,8
@0x00000dc=220 : Make = 'Canon\0'
@0x00000e2=226 : Model = 'Canon EOS 550D\0'
@0x0000102=258 : XResolution = 72
@0x000010a=266 : YResolution = 72
@0x0000112=274 : DateTime = '2014:08:31 15:02:38\0'
@0x0000126=294 : Artist = 'Lops\0'
@0x0000166=358 : Copyright = '(C)LOPS\0'
@0x00001a6=422 : (in IFD 0) 31 entries starting at file offset 0x1a8=424
@0x00001a8=424 : <0x829a=33434> ExposureTime [5 =RATIONAL 1] = @0x320=800
@0x00001b4=436 : <0x829d=33437> FNumber [5 =RATIONAL 1] = @0x328=808
@0x00001c0=448 : <0x8822=34850> ExposureProgram [3 =SHORT 1] = 4 = 'Shutter Priority'
@0x00001cc=460 : <0x8827=34855> ISOSpeedRatings [3 =SHORT 1] = 100
@0x00001d8=472 : <0x9000=36864> Version [7 =UNDEFINED 4] = '0221'
@0x00001e4=484 : <0x9003=36867> DateTimeOriginal [2 =ASCII 20] = @0x330=816
@0x00001f0=496 : <0x9004=36868> DateTimeDigitized [2 =ASCII 20] = @0x344=836
@0x00001fc=508 : <0x9101=37121> ComponentsConfiguration [7 =UNDEFINED 4] = 1,2,3,0 = 'YCbCr'
@0x0000208=520 : <0x9201=37377> ShutterSpeedValue [10=SRATIONAL 1] = @0x358=856
@0x0000214=532 : <0x9202=37378> ApertureValue [5 =RATIONAL 1] = @0x360=864
@0x0000220=544 : <0x9204=37380> ExposureBiasValue [10=SRATIONAL 1] = @0x368=872
@0x000022c=556 : <0x9207=37383> MeteringMode [3 =SHORT 1] = 5 = 'Pattern'
@0x0000238=568 : <0x9209=37385> Flash [3 =SHORT 1] = 16 = 'no flash - suppressed'
@0x0000244=580 : <0x920a=37386> FocalLength [5 =RATIONAL 1] = @0x370=880
@0x0000250=592 : <0x927c=37500> MakerNote [7 =UNDEFINED 44926] = @0x378=888
@0x000025c=604 : <0x9286=37510> UserComment [7 =UNDEFINED 264] = @0xb2f6=45814
@0x0000268=616 : <0x9290=37520> SubSecTime [2 =ASCII 3] = '84\000'
@0x0000274=628 : <0x9291=37521> SubSecTimeOriginal [2 =ASCII 3] = '84\000'
@0x0000280=640 : <0x9292=37522> SubSecTimeDigitized [2 =ASCII 3] = '84\000'
@0x000028c=652 : <0xa000=40960> FlashPixVersion [7 =UNDEFINED 4] = '0100'
@0x0000298=664 : <0xa001=40961> ColorSpace [3 =SHORT 1] = 1 = 'sRGB'
@0x00002a4=676 : <0xa002=40962> PixelXDimension [3 =SHORT 1] = 5184
@0x00002b0=688 : <0xa003=40963> PixelYDimension [3 =SHORT 1] = 3456
@0x00002bc=700 : <0xa005=40965> Interoperability [4 =LONG 1] = @0xb3fe=46078
@0x00002c8=712 : <0xa20e=41486> FocalPlaneXResolution [5 =RATIONAL 1] = @0xb41c=46108
@0x00002d4=724 : <0xa20f=41487> FocalPlaneYResolution [5 =RATIONAL 1] = @0xb424=46116
@0x00002e0=736 : <0xa210=41488> FocalPlaneResolutionUnit [3 =SHORT 1] = 2 = 'pixels per inch'
@0x00002ec=748 : <0xa401=41985> CustomRendered [3 =SHORT 1] = 0 = 'Normal'
@0x00002f8=760 : <0xa402=41986> ExposureMode [3 =SHORT 1] = 0 = 'Auto'
@0x0000304=772 : <0xa403=41987> WhiteBalance [3 =SHORT 1] = 0 = 'Auto'
@0x0000310=784 : <0xa406=41990> SceneCaptureType [3 =SHORT 1] = 0 = 'Standard'
@0x000031c=796 : **** next IFD offset 0
@0x0000320=800 : ============= VALUES, EXIF IFD ============
@0x0000320=800 : ExposureTime = 0.025 sec
@0x0000328=808 : FNumber = 5.6 APEX = 'f7.0'
@0x0000330=816 : DateTimeOriginal = '2014:08:31 15:02:38\0'
@0x0000344=836 : DateTimeDigitized = '2014:08:31 15:02:38\0'
@0x0000358=856 : ShutterSpeedValue = 5.375 APEX = '0.024097 sec'
@0x0000360=864 : ApertureValue = 5 APEX = 'f5.7'
@0x0000368=872 : ExposureBiasValue = 0 APEX
@0x0000370=880 : FocalLength = 55 mm
@0x0000378=888 : length 44926, Plain IFD scheme, 39 entries starting at offset 0x37a/890
@0x0000378=888 : MakerNoteId = '''
@0x000037a=890 : <0X0001= 1> CameraSettings [ 3=SHORT 49] = @0x552=1362
@0x0000386=902 : <0X0002= 2> FocusInfo [ 3=SHORT 4] = @0x5b4=1460
@0x0000392=914 : <0X0003= 3> TAG_0X0003 [ 3=SHORT 4] = @0x5bc=1468
@0x000039e=926 : <0X0004= 4> ShotInfo [ 3=SHORT 34] = @0x5c4=1476
@0x00003aa=938 : <0X0006= 6> ImageType [ 2=ASCII 15] = @0x608=1544
@0x00003b6=950 : <0X0007= 7> FirmwareVersion [ 2=ASCII 24] = @0x628=1576
@0x00003c2=962 : <0X0009= 9> OwnerName [ 2=ASCII 32] = @0x640=1600
@0x00003ce=974 : <0X000C= 12> CameraSerialNo [ 4=LONG 1] = 1433718828 = 'D02C53292'
@0x00003da=986 : <0X000D= 13> TAG_0X000D [ 7=UNDEFINED 1536] = @0x660=1632
@0x00003e6=998 : <0X0010= 16> TAG_0X0010 [ 4=LONG 1] = 2147484272
@0x00003f2=1010 : <0X0013= 19> TAG_0X0013 [ 3=SHORT 4] = @0xc60=3168
@0x00003fe=1022 : <0X0015= 21> TAG_0X0015 [ 4=LONG 1] = 2684354560
@0x000040a=1034 : <0X0019= 25> TAG_0X0019 [ 3=SHORT 1] = 1
@0x0000416=1046 : <0X0026= 38> TAG_0X0026 [ 3=SHORT 48] = @0xc68=3176
@0x0000422=1058 : <0X0083= 131> TAG_0X0083 [ 4=LONG 1] = 0
@0x000042e=1070 : <0X0093= 147> FileInfo** [ 3=SHORT 26] = @0xf28=3880
@0x000043a=1082 : <0X0095= 149> TAG_0X0095 [ 2=ASCII 70] = @0xf5c=3932
@0x0000446=1094 : <0X0096= 150> TAG_0X0096 [ 2=ASCII 16] = @0xfa2=4002
@0x0000452=1106 : <0X0097= 151> TAG_0X0097 [ 7=UNDEFINED 1024] = @0xfb2=4018
@0x000045e=1118 : <0X0098= 152> TAG_0X0098 [ 3=SHORT 4] = @0x13b2=5042
@0x000046a=1130 : <0X0099= 153> TAG_0X0099 [ 4=LONG 50] = @0x13ba=5050
@0x0000476=1142 : <0X00A0= 160> ColorInfo** [ 3=SHORT 14] = @0x1482=5250
@0x0000482=1154 : <0X00AA= 170> TAG_0X00AA [ 3=SHORT 6] = @0x149e=5278
@0x000048e=1166 : <0X00B4= 180> TAG_0X00B4 [ 3=SHORT 1] = 1
@0x000049a=1178 : <0X00D0= 208> TAG_0X00D0 [ 4=LONG 1] = 0
@0x00004a6=1190 : <0X00E0= 224> SensorInfo [ 3=SHORT 17] = @0x14aa=5290
@0x00004b2=1202 : <0X4001=16385> TAG_0X4001 [ 3=SHORT 1338] = @0x14cc=5324
@0x00004be=1214 : <0X4002=16386> TAG_0X4002 [ 3=SHORT 10420] = @0x1f40=8000
@0x00004ca=1226 : <0X4005=16389> TAG_0X4005 [ 7=UNDEFINED 16448] = @0x70a8=28840
@0x00004d6=1238 : <0X4008=16392> TAG_0X4008 [ 3=SHORT 3] = @0xb0e8=45288
@0x00004e2=1250 : <0X4009=16393> TAG_0X4009 [ 3=SHORT 3] = @0xb0ee=45294
@0x00004ee=1262 : <0X4010=16400> TAG_0X4010 [ 2=ASCII 32] = @0xb0f4=45300
@0x00004fa=1274 : <0X4011=16401> TAG_0X4011 [ 7=UNDEFINED 252] = @0xb114=45332
@0x0000506=1286 : <0X4012=16402> TAG_0X4012 [ 2=ASCII 32] = @0xb210=45584
@0x0000512=1298 : <0X4015=16405> TAG_0X4015 [ 7=UNDEFINED 116] = @0xb230=45616
@0x000051e=1310 : <0X4016=16406> TAG_0X4016 [ 4=LONG 6] = @0xb2a4=45732
@0x000052a=1322 : <0X4017=16407> TAG_0X4017 [ 4=LONG 2] = @0xb2bc=45756
@0x0000536=1334 : <0X4018=16408> TAG_0X4018 [ 4=LONG 3] = @0xb2c4=45764
@0x0000542=1346 : <0X4019=16409> TAG_0X4019 [ 7=UNDEFINED 30] = @0xb2d0=45776
@0x000054e=1358 : **** next IFD offset 0
@0x0000552=1362 : ============= VALUES, MakerNote ============
@0x0000552=1362 : 48 entries length 98
@0x0000554=1364 : CameraSettings.01_MacroMode = 2 = 'normal'
@0x0000556=1366 : CameraSettings.02_SelfTimer = 0 = 'off'
@0x0000558=1368 : CameraSettings.03_Quality = 4 = 'Lossless JPEG'
@0x000055a=1370 : CameraSettings.04_FlashMode = 0 = 'flash did not fire'
@0x000055c=1372 : CameraSettings.05_ContinuousMode = 0 = 'single or timer'
@0x000055e=1374 : CameraSettings.06_Unknown = 0
@0x0000560=1376 : CameraSettings.07_FocusMode = 0 = 'One Shot AF'
@0x0000562=1378 : CameraSettings.08_Unknown = 0
@0x0000564=1380 : CameraSettings.09_Unknown = 6
@0x0000566=1382 : CameraSettings.10_ImageSize = 65535 = 'undefined'
@0x0000568=1384 : CameraSettings.11_EasyShootMode = 1 = 'Manual'
@0x000056a=1386 : CameraSettings.12_DigitalZoom = 0 = 'none'
@0x000056c=1388 : CameraSettings.13_Contrast = 0 = 'Normal'
@0x000056e=1390 : CameraSettings.14_Saturation = 0 = 'Normal'
@0x0000570=1392 : CameraSettings.15_Sharpness = 32767 = 'undefined'
@0x0000572=1394 : CameraSettings.16_ISO = 0x7fff/32767 = 'undefined'
@0x0000574=1396 : CameraSettings.17_MeteringMode = 3 = 'Evaluative'
@0x0000576=1398 : CameraSettings.18_FocusType = 2 = 'Auto2'
@0x0000578=1400 : CameraSettings.19_AFPositionSelected = 0 = 'undefined'
@0x000057a=1402 : CameraSettings.20_ExposureMode = 2 = 'Shutter priority AE'
@0x000057c=1404 : CameraSettings.21_Unknown = 65535
@0x000057e=1406 : CameraSettings.22_LensType = 48
@0x0000580=1408 : CameraSettings.23_FocalLength_long = 55 units
@0x0000582=1410 : CameraSettings.24_FocalLength_short = 18 units
@0x0000584=1412 : CameraSettings.25_FocalUnits* = 1 unit per mm
@0x0000586=1414 : CameraSettings.26_Unknown = 160
@0x0000588=1416 : CameraSettings.27_Unknown = 332
@0x000058a=1418 : CameraSettings.28_FlashActivity = 0 = 'did not fire'
@0x000058c=1420 : CameraSettings.29_FlashDetails = 0 = ''
@0x000058e=1422 : CameraSettings.30_Unknown = 0
@0x0000590=1424 : CameraSettings.31_Unknown = 0
@0x0000592=1426 : CameraSettings.32_FocusMode = 65535 = 'undefined'
@0x0000594=1428 : CameraSettings.33_undefined = 0xffff/65535
@0x0000596=1430 : CameraSettings.34_undefined = 0xffff/65535
@0x0000598=1432 : CameraSettings.35_undefined = 0/0
@0x000059a=1434 : CameraSettings.36_ZoomedResValue** = 0
@0x000059c=1436 : CameraSettings.37_ZoomedResBase** = 0
@0x000059e=1438 : CameraSettings.38_undefined = 0/0
@0x00005a0=1440 : CameraSettings.39_undefined = 0xffff/65535
@0x00005a2=1442 : CameraSettings.40_undefined = 0xffff/65535
@0x00005a4=1444 : CameraSettings.41_undefined = 0/0
@0x00005a6=1446 : CameraSettings.42_ColorTone** = 0/0
@0x00005a8=1448 : CameraSettings.43_undefined = 0x7fff/32767
@0x00005aa=1450 : CameraSettings.44_undefined = 0xffff/65535
@0x00005ac=1452 : CameraSettings.45_undefined = 0xffff/65535
@0x00005ae=1454 : CameraSettings.46_undefined = 0/0
@0x00005b0=1456 : CameraSettings.47_undefined = 0/0
@0x00005b2=1458 : CameraSettings.48_undefined = 0xffff/65535
@0x00005b3=1459 :
@0x00005b4=1460 : 4 entries length 8
@0x00005b4=1460 : FocusInfo.00_unknown = 0
@0x00005b6=1462 : FocusInfo.01_FocalLength = 55
@0x00005b8=1464 : FocusInfo.02_FocalPlaneXSize = 8902
@0x00005ba=1466 : FocusInfo.03_FocalPlaneYSize = 19690
@0x00005bb=1467 :
@0x00005bc=1468 : TAG_0X0003 = 0,0,0,0
@0x00005c4=1476 : 33 entries length 68
@0x00005c6=1478 : ShotInfo.01_Unknown = 00
@0x00005c8=1480 : ShotInfo.02_ISO = 160
@0x00005ca=1482 : ShotInfo.03_Unknown = 0x3048
@0x00005cc=1484 : ShotInfo.04_Unknown = 0xa0160
@0x00005ce=1486 : ShotInfo.05_Unknown = 0xac172
@0x00005d0=1488 : ShotInfo.06_ExposureCompensation** = 0
@0x00005d2=1490 : ShotInfo.07_WhiteBalance = 0 = 'Auto'
@0x00005d4=1492 : ShotInfo.08_Unknown = 0x33
@0x00005d6=1494 : ShotInfo.09_SequenceNumber = 0
@0x00005d8=1496 : ShotInfo.10_Unknown = 0x88
@0x00005da=1498 : ShotInfo.11_Unknown = 0x88
@0x00005dc=1500 : ShotInfo.12_Unknown = 0x97151
@0x00005de=1502 : ShotInfo.13_Unknown = 00
@0x00005e0=1504 : ShotInfo.14_AFPositionUsed = 0 = 'MF'
@0x00005e2=1506 : ShotInfo.15_FlashBias = 0 = '0 EV'
@0x00005e4=1508 : ShotInfo.16_AutoExposureBracketing** = 0
@0x00005e6=1510 : ShotInfo.17_AEBracketValue** = 0
@0x00005e8=1512 : ShotInfo.18_Unknown = 0x11
@0x00005ea=1514 : ShotInfo.19_FocusDistanceMax** = 0 mm
@0x00005ec=1516 : ShotInfo.20_FocusDistanceMin** = 0 mm
@0x00005ee=1518 : ShotInfo.21_ApertureValue** = 160
@0x00005f0=1520 : ShotInfo.22_ExposureTime** = 172
@0x00005f2=1522 : ShotInfo.23_Undefined = 0x64100
@0x00005f4=1524 : ShotInfo.24_BulbDuration** = 0
@0x00005f6=1526 : ShotInfo.25_Undefined = 00
@0x00005f8=1528 : ShotInfo.26_Undefined = 0xf8248
@0x00005fa=1530 : ShotInfo.27_AutoRotate** = 65535
@0x00005fc=1532 : ShotInfo.28_Undefined = 0xffff65535
@0x00005fe=1534 : ShotInfo.29_SelfTimer2** = 65535
@0x0000600=1536 : ShotInfo.30_Undefined = 0xffff65535
@0x0000602=1538 : ShotInfo.31_Undefined = 00
@0x0000604=1540 : ShotInfo.32_Undefined = 00
@0x0000606=1542 : ShotInfo.33_Undefined = 00
@0x0000607=1543 :
@0x0000608=1544 : ImageType = 'Canon EOS 550D\0'
@0x0000628=1576 : FirmwareVersion = 'Firmware Version 1.0.9\0\0'
@0x0000640=1600 : OwnerName = '\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0'
@0x0000660=1632 : TAG_0X000D : length 1536 # UNDEFINED (not dumped, use -U)
@0x0000c60=3168 : TAG_0X0013 = 0,159,7,112
@0x0000c68=3176 : TAG_0X0026 = 96,2,9,9,5184 ... ,65535 (48) -> @3270
@0x0000f28=3880 : FileInfo** = 52,0,0,0,0 ... ,0 (26) -> @3930
@0x0000f5c=3932 : TAG_0X0095 = 'EF-S18-55mm f/3.5-5.6 IS\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0'
@0x0000fa2=4002 : TAG_0X0096 = 'VC0645382\0\0\0\0\0\0\0'
@0x0000fb2=4018 : TAG_0X0097 : length 1024 # UNDEFINED (not dumped, use -U)
@0x00013b2=5042 : TAG_0X0098 = 0,0,0,0
@0x00013ba=5050 : TAG_0X0099 = 200,4,1 ... ,0 (50) -> @5246
@0x0001482=5250 : ColorInfo** = 28,0,1,0,0 ... ,0 (14) -> @5276
@0x000149e=5278 : TAG_0X00AA = 12,466,1024,1024,722,1
@0x00014aa=5290 : 16 entries length 34
@0x00014ac=5292 : SensorInfo.01_SensorWidth = 5344
@0x00014ae=5294 : SensorInfo.02_SensorHeight = 3516
@0x00014b0=5296 : SensorInfo.03_Unknown = 1
@0x00014b2=5298 : SensorInfo.04_Unknown = 1
@0x00014b4=5300 : SensorInfo.05_SensorLeftBorder = 152
@0x00014b6=5302 : SensorInfo.06_SensorTopBorder = 56
@0x00014b8=5304 : SensorInfo.07_SensorRightBorder = 5335
@0x00014ba=5306 : SensorInfo.08_SensorBottomBorder = 3511
@0x00014bc=5308 : SensorInfo.09_Undefined = 00
@0x00014be=5310 : SensorInfo.10_Undefined = 00
@0x00014c0=5312 : SensorInfo.11_Undefined = 00
@0x00014c2=5314 : SensorInfo.12_Undefined = 00
@0x00014c4=5316 : SensorInfo.13_Undefined = 00
@0x00014c6=5318 : SensorInfo.14_Undefined = 00
@0x00014c8=5320 : SensorInfo.15_Undefined = 00
@0x00014ca=5322 : SensorInfo.16_Undefined = 00
@0x00014cb=5323 :
@0x00014cc=5324 : TAG_0X4001 = 7,766,1024,1024,376 ... ,0 (1338) -> @7998
@0x0001f40=8000 : TAG_0X4002 = 20840,8197,0,0,0 ... ,0 (10420) -> @28838
@0x00070a8=28840 : TAG_0X4005 : length 16448 # UNDEFINED (not dumped, use -U)
@0x000b0e8=45288 : TAG_0X4008 = 129,129,129
@0x000b0ee=45294 : TAG_0X4009 = 0,0,0
@0x000b0f4=45300 : TAG_0X4010 = '\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0'
@0x000b114=45332 : TAG_0X4011 : length 252 # UNDEFINED (not dumped, use -U)
@0x000b210=45584 : TAG_0X4012 = '\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0'
@0x000b230=45616 : TAG_0X4015 : length 116 # UNDEFINED (not dumped, use -U)
@0x000b2a4=45732 : TAG_0X4016 = 24,0,1 ... ,0 (6) -> @45752
@0x000b2bc=45756 : TAG_0X4017 = 262918,1409286145
@0x000b2c4=45764 : TAG_0X4018 = 12,1,3
@0x000b2d0=45776 : TAG_0X4019 : length 30 # UNDEFINED (not dumped, use -U)
*0x000b2ed=45805 : ---- End of values before end of MakerNote
0x000b2ee=45806 : 49 49 2a 00 78 03 00 00 |II*.x... |
@0x000b2f5=45813 :
@0x000b2f6=45814 : UserComment = length 256+8: (CC=undefined) = (256 nulls)
@0x000b3fe=46078 : 2 entries starting at file offset 0xb400=46080
@0x000b400=46080 : <0x0001= 1> InteroperabilityIndex [2 =ASCII 4] = 'R98'
@0x000b40c=46092 : <0x0002= 2> InteroperabilityVersion [7 =UNDEFINED 4] = '0100'
@0x000b418=46104 : **** next IFD offset 0
@0x000b41b=46107 :
@0x000b41c=46108 : FocalPlaneXResolution = 5728.18
@0x000b424=46116 : FocalPlaneYResolution = 5808.4
-0x000b42b=46123 :
@0x000b42b=46123 :
>0x000cc14=52244 : <=====> Start of JPEG data for IFD 0, data length 960304
>0x000cc14=52244 :
>0x000cc16=52246 : length 132
>0x000cc9c=52380 : length 17, 8 bits/sample, components=3, width=5184, height=3456
>0x000ccaf=52399 : length 418 table class = 0 table id = 0
>0x000ce53=52819 : length 12 start of JPEG data, 3 components 17915904 pixels
>0x00f7342=1012546 : JPEG length 960304
>0x00f7343=1012547 : End of JPEG data ====
@0x000b42c=46124 : 2 entries starting at file offset 0xb42e=46126
@0x000b42e=46126 : <0x0201= 513> JPEGInterchangeFormat [4 =LONG 1] = @0xb564=46436
@0x000b43a=46138 : <0x0202= 514> JPEGInterchangeFormatLength [4 =LONG 1] = 5807
@0x000b446=46150 : **** next IFD offset 46154(+ 0 = 0xb44a/46154)
>0x000b564=46436 : #### Start of JPEG thumbnail data for IFD 1, length 5807 ####
>0x000b564=46436 :
>0x000b566=46438 : length 132
>0x000b5ec=46572 : length 17, 8 bits/sample, components=3, width=160, height=120
>0x000b5ff=46591 : length 418 table class = 0 table id = 0
>0x000b7a3=47011 : length 12 start of JPEG data, 3 components 19200 pixels
>0x000cc11=52241 : JPEG length 5807
>0x000cc12=52242 : #### End of JPEG thumbnail data for IFD 1, length 5807 ####
@0x000b449=46153 :
@0x000b44a=46154 : 13 entries starting at file offset 0xb44c=46156
@0x000b44c=46156 : <0x0100= 256> ImageWidth [3 =SHORT 1] = 668
@0x000b458=46168 : <0x0101= 257> ImageLength [3 =SHORT 1] = 432
@0x000b464=46180 : <0x0102= 258> BitsPerSample [3 =SHORT 3] = @0xb4ec=46316
@0x000b470=46192 : <0x0103= 259> Compression [3 =SHORT 1] = 1 = 'uncompressed'
@0x000b47c=46204 : <0x0106= 262> PhotometricInterpretation [3 =SHORT 1] = 2 = 'RGB'
@0x000b488=46216 : <0x0111= 273> StripOffsets [4 =LONG 1] = @1012548
@0x000b494=46228 : <0x0115= 277> SamplesPerPixel [3 =SHORT 1] = 3
@0x000b4a0=46240 : <0x0116= 278> RowsPerStrip [3 =SHORT 1] = 432
@0x000b4ac=46252 : <0x0117= 279> StripByteCounts [4 =LONG 1] = 1731456
@0x000b4b8=46264 : <0x011c= 284> PlanarConfiguration [3 =SHORT 1] = 1 = 'chunky/contig'
@0x000b4c4=46276 : <0xc5d9=50649> TAG_CR2c5d9 [4 =LONG 1] = 2
@0x000b4d0=46288 : <0xc6c5=50885> TAG_0xc6c5 [4 =LONG 1] = 3
@0x000b4dc=46300 : <0xc6dc=50908> TAG_0xc6dc [4 =LONG 4] = @0xb4f2=46322
@0x000b4e8=46312 : **** next IFD offset 46338(+ 0 = 0xb502/46338)
@0x000b4ec=46316 : ============= VALUES, IFD 2 ============
@0x000b4ec=46316 : BitsPerSample = 16,16,16
@0x000b4f2=46322 : TAG_0xc6dc = 650,432,19,0
@0x000b501=46337 :
>0x00f7344=1012548 : <=-=-=> Start of TIFF RGB uncompressed image data for IFD 2, data length 1731456
0x00f7344=1012548 : 02 08 01 08 01 08 02 08 ff 07 ff 07 ff 07 00 08 |................|
0x00f7354=1012564 : 00 08 04 08 00 08 02 08 fe 07 01 08 00 08 ff 07 |................|
0x00f7364=1012580 : 01 08 01 08 ff 07 ff 07 ff 07 03 08 02 08 fe 07 |................|
0x00f7374=1012596 : 02 08 00 08 00 08 02 08 ff 07 00 08 08 08 01 08 |................| etc...
>0x029dec3=2744003 : End of image data
@0x000b502=46338 : 7 entries starting at file offset 0xb504=46340
@0x000b504=46340 : <0x0103= 259> Compression [3 =SHORT 1] = 6 = 'Exif/old JPEG'
@0x000b510=46352 : <0x0111= 273> StripOffsets [4 =LONG 1] = @2749252
@0x000b51c=46364 : <0x0117= 279> StripByteCounts [4 =LONG 1] = 17111015
@0x000b528=46376 : <0xc5d8=50648> TAG_CR2c5d8 [4 =LONG 1] = 1
@0x000b534=46388 : <0xc5e0=50656> TAG_CR2c5e0 [4 =LONG 1] = 3
@0x000b540=46400 : <0xc640=50752> TAG_CR2c640 [3 =SHORT 3] = @0xb55c=46428
@0x000b54c=46412 : <0xc6c5=50885> TAG_0xc6c5 [4 =LONG 1] = 1
@0x000b558=46424 : **** next IFD offset 0
@0x000b55c=46428 : ============= VALUES, IFD 3 ============
@0x000b55c=46428 : TAG_CR2c640 = 2,1728,1888
@0x000b561=46433 :
@0x029f344=2749252 : <=====> Start of JPEG data for IFD 3, data length 17111015
@0x029f344=2749252 :
@0x029f346=2749254 : length 66 table class = 0 table id = 0
@0x029f38a=2749322 : length 20, 14 bits/sample, components=4, width=1336, height=3516
@0x029f3a0=2749344 : length 14 start of JPEG data, 4 components 4697376 pixels
@0x12f0b29=19860265: JPEG length 17111015
@0x12f0b2a=19860266: End of JPEG data ====
-0x12f0b2a=19860266: END OF FILE
@0x000cc14=52244 : Start of JPEG baseline DCT compressed image [5184x3456] length 960304 (IFD 0)
-0x00f7343=1012547 : End of JPEG image data
@0x000b564=46436 : Start of JPEG baseline DCT compressed reduced-resolution image [160x120] length 5807 (IFD 1)
-0x000cc12=52242 : End of JPEG reduced-resolution image data
@0x00f7344=1012548 : Start of TIFF RGB uncompressed reduced-resolution image [668x432] length 1731456 (IFD 2)
-0x029dec3=2744003 : End of TIFF reduced-resolution image data
@0x029f344=2749252 : Start of JPEG lossless seq Huffman reduced-resolution image [1336x3516] length 17111015 (IFD 3)
-0x12f0b2a=19860266: End of JPEG reduced-resolution image data
Number of images = 4
File Format = TIFF/EXIF [CR2] # with MakerNote (Canon [1])

Both fields supported by

Both fields supported by LibRaw (EXIF tag 315 and Canon tag 9) contains empty author name.

Tag #294 is very uncommon (what version of Exifprobe do you use? Version from git repo knows nothing about this tag)

-- Alex Tutubalin

I am using the exifprobe

I am using the exifprobe version 2.0.1 . That is the one from the official Ubuntu 14.04 repository.

Program: 'exifprobe' version 2.0.1
Compiled: Tue Jun 15 23:17:15 UTC 2010
Copyright (C) 2005 Duane H. Hesser