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Posted on Wed May 24 22:37:01 2006 by gregkeene
Unblessed reference error
In the code below, I get the error: Can't call method "SetNewValue" on unblessed reference at /Users/greg/bin/rawtest.pl line 13. Any help is appreciated! Greg ----
#!/usr/bin/perl -w use Image::ExifTool 'ImageInfo'; #use IO::File; #use Time::Local; $photodirectory = "/Volumes/d\$/PhotoMaster/rawtest/"; opendir(DIRHANDLE, "$photodirectory") || die "Cannot opendir $photodirectory: $!"; foreach $file (sort readdir(DIRHANDLE)) { my $info = ImageInfo($photodirectory.$file); if (($file =~ /4892test.cr2/)|($file =~ /4892test.CR2/)) { $info->SetNewValue("Caption", "Gregs test"); $info->WriteInfo($file); foreach (keys %$info) { if ($_ =~ /ObjectName/) { print "$_: $info->{$_}\n"; } } } } closedir(DIRHANDLE); exit;
Direct Responses: 2343 | Write a response
Posted on Thu May 25 14:46:33 2006 by exiftool in response to 2338
Re: Unblessed reference error
Hi Greg,

You need to call SetNewValue() with an instance of an ExifTool object. ie)

#!/usr/bin/perl -w use Image::ExifTool 'ImageInfo'; #use IO::File; #use Time::Local; my $exifTool = new Image::ExifTool; $photodirectory = "/Volumes/d\$/PhotoMaster/rawtest/"; opendir(DIRHANDLE, "$photodirectory") || die "Cannot opendir $photodirectory: $!"; foreach $file (sort readdir(DIRHANDLE)) { my $info = $exifTool->ImageInfo($photodirectory.$file); if (($file =~ /4892test.cr2/)|($file =~ /4892test.CR2/)) { $exifTool->SetNewValue("ImageDescription", "Gregs test"); $exifTool->WriteInfo($photodirectory.$file); foreach (keys %$info) { if ($_ =~ /ObjectName/) { print "$_: $info->{$_}\n"; } } } } closedir(DIRHANDLE); exit;

The $info hash returned by ImageInfo() is not the same as an ExifTool object. I hope this makes sense.

While I was making changes, I also called ImageInfo() with the $exifTool object I created. Also, I have a few other comments about your script: 1) I have added the directory to the filename in the WriteInfo() call, otherwise this call won't find the file. 2) There is no writable "Caption" tag. You want to either write "ImageDescription" or "UserComment". 3) I'm not sure why you're looking for the "ObjectName" tag, but I don't think you'll find it. 4) The $info you're looking at will be before the new information you write. If you want to read back the new information you wrote, call ImageInfo() after WriteInfo().

- Phil
Direct Responses: 2345 | Write a response
Posted on Thu May 25 18:22:38 2006 by gregkeene in response to 2343
Re: Unblessed reference error
Phil: We're getting close. But I'm still not able to set any values. I tried your code exactly from the post above and also changed the field to one I knew my camera had. So, to simplify the discussion, I've changed the code to this, still doesn't work: -----------------------------------------------------------------------
#!/usr/bin/perl -w use Image::ExifTool 'ImageInfo'; #use IO::File; #use Time::Local; my $exifTool = new Image::ExifTool; $photodirectory = "/Volumes/d\$/PhotoMaster/rawtest/"; $file = "20060429-30D-IMG_4892test.CR2"; my $info = $exifTool->ImageInfo($photodirectory.$file); $exifTool->SetNewValue("ImageDescription", "A499JKLLL"); $exifTool->WriteInfo($photodirectory.$file); exit;
----------------------------------------------------------------------- Also, using this code, here are the values I'm getting out of my files:
foreach (keys %$info) { print "$_: $info->{$_}\n"; }
-----------------------------------------------------------------------
WhiteBalance (1): Auto FocalPlaneYSize: 15.37mm BulbDuration: 0 TimeCreated: 12:38:24-08:00 FlashFiring: Fires SensorHeight: 2360 ShootingMode: Shutter Speed Priority AE CopyrightNotice: Copyright 2006 Greg Keene, All Rights Reserved. SensorBlueLevel: 0 WB_RGGBLevelsFluorescent: 1853 1057 1057 2352 FNumber (1): 11 Source: SourceValue BitsPerSample: 8 8 8 Rights: Copyright 2006 Greg Keene, All Rights Reserved. ZoomTargetWidth: 0 MIMEType: image/x-raw WB_RGGBLevelsPC1: 8191 1056 1056 512 MirrorLockup: Disable LensType: EF100-400mm f/4.5-5.6L IS USM Compression (1): JPEG (old-style) FileType: CR2 Credit (1): CreditValue FlashActivity: 0 MagnifiedView: Image playback only ImageHeight: 1152 DateTimeOriginal: 2006:04:29 12:38:24 WB_RGGBLevelsKelvin: 2060 1024 1024 1535 FocusDistanceUpper: 0 ISO (1): 400 PhotoEffect: Off ScaleFactor35efl: 1.6 ColorTempCloudy: 6000 Marked: True By-lineTitle: TitleValue ComponentsConfiguration: WBShiftAB: 0 ColorTempMeasured: 5893 Saturation: Normal BracketMode: Off WhiteBalanceRed: 0 WB_RGGBLevelsAuto: 2189 1024 1024 1402 RedBalance: 2.137695 ModifyDate: 2006:04:29 12:38:24 CanonImageWidthAsShot: 3504 FocalLength: 400.0mm ColorTempPC2: 3761 Credit: CreditValue MeteringMode (1): Multi-segment WhiteBalance: Auto Urgency (1): 5 Lens: 100.0 - 400.0mm SensorWidth: 3596 SafetyShiftInAvOrTv: Disable ExposureTime: 1/250 HyperfocalDistance: 756.35 m WB_RGGBLevelsShade: 2372 1024 1024 1268 CircleOfConfusion: 0.019 mm FlashExposureComp: 0 ExposureTime (1): 1/256 Compression: JPEG (old-style) CanonFlashMode: Off ThumbnailLength: 8152 ShortFocal: 100 WBBracketValueAB: 0 ColorSpace (1): sRGB Caption-Abstract: Coye Francies before the Spring game. DigitalZoom: None ObjectName: ObjectName DateCreated (1): 2006:04:29 ExposureMode: Auto CanonImageType: Canon EOS 30D XResolution: 72 StripOffsets (1): 449776 SensorRightBorder: 3587 ColorTempAuto: 5893 ShutterCount: 2033254592 TimeCreated (1): 123824-0800 EasyMode: Manual ETTLII: Evaluative WB_RGGBLevelsPC2: 8191 1056 1056 512 UserComment: FocusDistanceLower: 0 ExposureCompensation: 0 ColorSpace: sRGB Title: ObjectName FlashGuideNumber: 0 WB_RGGBLevels: 2189 1024 1024 1402 SequenceNumber: 0 LensAFStopButton: AF stop WBBracketValueGM: 0 Sharpness: +3 CustomRendered: Normal RawJpgQuality: Fine ISOExpansion: On ExposureLevelIncrements: 1/3 Stop CanonExposureMode: Shutter Speed Priority AE FocalPlaneXResolution: 3959.322 StripByteCounts: 7089343 SensorBottomBorder: 2354 ExifImageLength: 2336 ColorTempShade: 7000 StripByteCounts (1): 294912 DigitalGain: 0 FocusRange: Not Known WB_RGGBLevelsDaylight: 2060 1024 1024 1535 BracketShotNumber: 0 SensorTopBorder: 19 ColorTone: Normal FocalType: Zoom AFAssistBeam: Emits ApplicationRecordVersion: 3 Self-timer2: 0 ThumbnailOffset: 76800 ColorTempAsShot: 5893 LongExposureNoiseReduction: Off FlashSyncSpeedAv: Auto Model: Canon EOS 30D FlashpixVersion: 0100 ShutterSpeed: 1/250 CanonModelID: EOS 30D ResolutionUnit: inches FocalLength35efl: 400.0mm (35mm equivalent: 625.0mm) CanonImageHeightAsShot: 2336 MeteringMode: Evaluative MaxAperture: 5.6 InteropVersion: 0100 WB_RGGBLevelsMeasured: 2187 1024 1023 1400 SamplesPerPixel: 3 WBBracketMode: Off SerialNumber: 0420300677 WB_RGGBLevelsAsShot: 2189 1024 1024 1402 Source (1): SourceValue ExifToolVersion: 6.15 DateTimeCreated: 2006:04:29 12:38:24-08:00 StripOffsets: 744688 ISO: 400 Directory: /Volumes/d$/PhotoMaster/rawtest PlanarConfiguration: Chunky Make: Canon MacroMode: Normal ImageDescription: Coye Francies before the Spring game. InteropIndex: R98 LensType (1): Unknown (-1) BlueBalance: 1.369141 ApertureValue: 11.0 ExposureCompensation (1): 0 PhotometricInterpretation: RGB ExifImageWidth: 3504 MinAperture: 38 ExposureProgram: Shutter speed priority AE SensorLeftBorder: 84 WB_RGGBLevelsFlash: 2250 1024 1024 1348 FocalUnits: 1 Compression (2): JPEG (old-style) PreviewImageLength: 364824 ColorTemperature: 5200 FocalPlaneXSize: 23.04mm Quality: RAW DriveMode: Continuous shooting WB_RGGBLevelsCloudy: 2222 1024 1024 1391 ColorTempKelvin: 5210 Lens35efl: 100.0 - 400.0mm (35mm equivalent: 156.2 - 625.0mm) SuperimposedDisplay: On FocusMode: AI Servo AF AEBBracketValue: 0 Flash: Off PreviewImage: SCALAR(0x186f924) ShutterSpeedValue: 1/250 CanonImageSize: Unknown (-1) PictureStyle: Standard Orientation: Horizontal (normal) FocalLength (1): 400mm BracketValue: 0 WB_RGGBLevelsTungsten: 1537 1095 1095 2595 ExifVersion: 0221 ColorTempTungsten: 3200 ColorTempFluorescent: 3752 ImageSize: 1728x1152 ColorTempPC3: 3761 DateCreated: 2006:04:29 WB_RGGBLevelsCustom: 2060 1024 1024 1535 ThumbnailImage: SCALAR(0x19300b4) FocusContinuous: Continuous Contrast: Normal SensorRedLevel: 0 SlowShutter: None ImageWidth: 1728 CanonImageWidth: 3504 ColorTempDaylight: 5200 WB_RGGBLevelsPC3: 8191 1056 1056 512 Keywords: OSU, Beavers, Spring Practice, Football, Spring, OSU Beavers, Oregon State University, Be +averPigSkin, 2006, BeaversSpring20060429, Game, Spring Game, Coye Francies ImageHeight (1): 256 PreviewImageStart: 84952 ToneCurve: Standard ImageWidth (1): 384 ZoomSourceWidth: 0 SharpnessFrequency: n/a ColorTempCustom: 5210 ContinuousDrive: Continuous, Low SerialNumberFormat: Format 2 ColorTempFlash: 6290 RowsPerStrip: 256 Subject: OSU, Beavers, Spring Practice, Football, Spring, OSU Beavers, Oregon State University, Bea +verPigSkin, 2006, BeaversSpring20060429, Game, Spring Game, Coye Francies WhiteBalanceBlue: 0 FocalPlaneYResolution: 3959.322 BitsPerSample (1): 8 8 8 FileName: 20060429-30D-IMG_4892test.CR2 FlashBits: (none) AEBSequence: 0,-,+/Enabled AFPointSelectionMethod: Normal TargetAperture: 11 TargetExposureTime: 1/256 CreateDate: 2006:04:29 12:38:24 WBShiftGM: 0 AddOriginalDecisionData: Off FileModifyDate: 2006:05:24 12:06:36 AutoRotate: None Urgency: 5 LongFocal: 400 ColorTempPC1: 3761 AuthorsPosition: TitleValue CanonImageHeight: 2336 RawJpgSize: Medium SceneCaptureType: Standard ShutterCurtainSync: 1st-curtain sync FileSize: 7 MB ToningEffect: None AutoExposureBracketing: Off YResolution: 72 FilterEffect: None Aperture: 11.0 FocalPlaneResolutionUnit: inches FlashOn: Off SetFunctionWhenShooting: Default (no function) FNumber: 11.0 MenuButtonDisplayPosition: Previous (top if power off) CanonFirmwareVersion: Firmware 1.0.4 Self-timer: 0 Shutter-AELock: AF/AE lock NoiseReduction: Off Description: Coye Francies before the Spring game. OwnerName: unknown
----------------------------------------------------------------------- Thanks again for all your help. Best regards, Greg
Direct Responses: 2346 | Write a response
Posted on Thu May 25 18:52:27 2006 by exiftool in response to 2345
Re: Unblessed reference error
Now that is a mystery. Your script works fine here with my test 30D CR2 image. Here is my terminal session:

> cp ../pics/Canon30D_IMG_0092.CR2 tmp/a.cr2 > ./exiftool tmp/a.cr2 -imagedescription > ./ttt > ./exiftool tmp/a.cr2 -imagedescription Image Description : A499JKLLL > more ttt #!/usr/bin/perl -w BEGIN { push @INC, 'lib' } use Image::ExifTool 'ImageInfo'; #use IO::File; #use Time::Local; my $exifTool = new Image::ExifTool; $photodirectory = "tmp/"; $file = "a.cr2"; my $info = $exifTool->ImageInfo($photodirectory.$file); $exifTool->SetNewValue("ImageDescription", "A499JKLLL"); $exifTool->WriteInfo($photodirectory.$file); my $err = $exifTool->GetValue('Error'); $err and warn "Error: $err\n"; my $warn = $exifTool->GetValue('Warning'); $warn and warn "Warning: $warn\n"; exit; >

Notice I added a few lines at the end of the script to print errors and warnings... they didn't print anything for me, but they might help you diagnose the problem you are having.

- Phil
Direct Responses: 2347 | Write a response
Posted on Thu May 25 19:11:24 2006 by gregkeene in response to 2346
Re: Unblessed reference error

I changed my code ti include your errors, here's my code:

#!/usr/bin/perl -w BEGIN { push @INC, 'lib' } use Image::ExifTool 'ImageInfo'; #use IO::File; #use Time::Local; my $exifTool = new Image::ExifTool; $photodirectory = "/Volumes/d\$/PhotoMaster/rawtest/"; $file = "20060429-30D-IMG_4892test.CR2"; my $info = $exifTool->ImageInfo($photodirectory.$file); $exifTool->SetNewValue("ImageDescription", "A499JKLLL"); $exifTool->WriteInfo($photodirectory.$file); my $err = $exifTool->GetValue('Error'); $err and warn "Error: $err\n"; my $warn = $exifTool->GetValue('Warning'); $warn and warn "Warning: $warn\n"; exit;

I get this error:
Error: [minor] 2060 unreferenced bytes at end of file not copied

Greg
Direct Responses: 2349 | Write a response
Posted on Thu May 25 19:21:54 2006 by exiftool in response to 2347
Re: Unblessed reference error
This is odd. Did you edit the CR2 with any software which could have added the 2060 byte trailer? If the image is straight out of the camera, perhaps it is a different firmware version than my sample. In this case, it would be useful to have a sample so I can determine if this new information is significant.

You can ignore the minor error and force the image to be written by adding this line to your script:

$exifTool->Options(IgnoreMinorErrors => 1);

But it would be nice to know what the trailer contains before you go and discard it like this.
Direct Responses: 2351 | Write a response
Posted on Thu May 25 20:15:44 2006 by gregkeene in response to 2349
Re: Unblessed reference error
These files have had their IPTC tags changed by BreezeBrowser Pro and Photo Mechanic. Other than that, no changes. I'll send you an email with a link to a few files. I have 1.0.4 firmware. Greg
Direct Responses: 2352 | Write a response
Posted on Thu May 25 20:57:05 2006 by exiftool in response to 2351
Re: Unblessed reference error
Hi Greg,

Thanks for the samples. Yup, that's the problem. One of those two pieces of software is adding a non-standard trailer containing what looks to be an empty IPTC structure. Deleting this shouldn't affect the image, but you may lose some of the information you added to the image.

You can use ExifTool will write the ImageDescription if you use the IgnoreMinorErrors option, but you will lose this trailer.
Direct Responses: 2353 | Write a response
Posted on Thu May 25 21:16:29 2006 by gregkeene in response to 2352
Re: Unblessed reference error
That did it. I'm going to do some testing with both packages from native CR2 files and I'll post my results here. Thanks again for everything! Greg
Direct Responses: 2359 | Write a response
Posted on Fri May 26 17:30:28 2006 by exiftool in response to 2353
Re: Unblessed reference error
I downloaded Photo Mechanic and ran some tests myself. The problem is more severe than I thought:

It turns out that editing a CR2 with Photo Mechanic changes it so that ExifTool no longer recognizes it as a CR2 image. This is because Photo Mechanic relocates IFD0 to an offset which is not the standard CR2 location. The result is that the image is written as a regular TIFF, so the CR2 header and trailers are lost.

I have just released ExifTool 6.21, which has new logic to identify CR2 images which have been edited by Photo Mechanic. This version should solve your problems, including preserving the Photo Mechanic trailer.

Anyone writing CR2 images which may have been edited by Photo Mechanic should update to this new version.

- Phil
Direct Responses: 2360 | Write a response
Posted on Fri May 26 18:59:34 2006 by gregkeene in response to 2359
Re: Unblessed reference error
Phil:

I downloaded installed and tested 6.21. In doing so I removed the command. So far everything looks good on files that weren't part of my previous testing. However the files that were part of my previous testing with Image::ExifTool and Photo Mechanic are probably toast -- which is why there were test files. They still generate errors. I have no need to recover them, I only mention it for others who might use Photo Mechanic with Image::ExifTool (and probably other tools) on CR2 (and probably other raw formats) -- definitely upgrade.

Phil, thanks again for everything and your amazing responsiveness.

Greg

Direct Responses: 2361 | Write a response
Posted on Fri May 26 19:34:12 2006 by exiftool in response to 2360
Re: Unblessed reference error
To clarify the situation:

Your old test files will have lost the CR2 identifier, so they will generate minor errors when you write them. But they are not toast, and still should be OK when used with most image utilities. However, it is a good idea to upgrade.

The changes only affect writing of CR2 images. Other RAW formats don't have an identifier like CR2, so this isn't a problem. However, you may still get the "[minor] unreferenced bytes" error when writing other TIFF-based RAW formats if they have been edited by Photo Mechanic. I will look into fixing this for other RAW file types.
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