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2023.04.13 09:32 "Re: [Tiff] TIffWriteDirectory() causes problems", by David C. Partridge

Grump

I changed the code so this is done before I write the image data:

                    // 
                    TIFFSetDirectory(m_tiff, 0); 
                    TIFFSetField(m_tiff, TIFFTAG_EXIFIFD, dir_offset_EXIF); 
                    //TIFFCheckpointDirectory(m_tiff); 
                    TIFFWriteDirectory(m_tiff); 
                    TIFFSetDirectory(m_tiff, 0);

(is CheckpointDirectory() supposed to have the same effect as WriteDirectory followed by SetDirectory ???)

But while it solved the issue with scanline size, the main IFD ended up at the END of the file again:

C:\Users\amonra\jhove>jhove "C:\Users\amonra\Documents\Astrophotography\DSS Test Images\Covington\TestImages\Bias\MasterOffset_ISO200.tif" 
Jhove (Rel. 1.26.1, 2022-07-14) 
Date: 2023-04-13 10:17:09 BST 
RepresentationInformation: C:\Users\amonra\Documents\Astrophotography\DSS Test Images\Covington\TestImages\Bias\MasterOffset_ISO200.tif 
  ReportingModule: TIFF-hul, Rel. 1.9.3 (2022-04-22) 
  LastModified: 2023-04-13 06:46:48 BST 
  Size: 36040428 
  Format: TIFF 
  Version: 6.0 
  Status: Well-Formed and valid 
  SignatureMatches: 
   TIFF-hul 
  InfoMessage: Unknown TIFF IFD tag: 340 
   ID: TIFF-HUL-12 
   Offset: 36040184 
  InfoMessage: Unknown TIFF IFD tag: 341 
   ID: TIFF-HUL-12 
   Offset: 36040196 
  InfoMessage: Unknown TIFF IFD tag: 50002 
   ID: TIFF-HUL-12 
   Offset: 36040244 
  InfoMessage: Unknown TIFF IFD tag: 50006 
   ID: TIFF-HUL-12 
   Offset: 36040256 
  InfoMessage: Unknown TIFF IFD tag: 50007 
   ID: TIFF-HUL-12 
   Offset: 36040268 
  InfoMessage: Unknown TIFF IFD tag: 50008 
   ID: TIFF-HUL-12 
   Offset: 36040280 
  InfoMessage: Unknown TIFF IFD tag: 50009 
   ID: TIFF-HUL-12 
   Offset: 36040292 
  InfoMessage: Unknown TIFF IFD tag: 50010 
   ID: TIFF-HUL-12 
   Offset: 36040304 
  MIMEtype: image/tiff 
  Profile: TIFF/IT-MP (ISO 12639:1998) 
  TIFFMetadata: 
   ByteOrder: little-endian 
   IFDs: 
    Number: 2 
    IFD: 
     Offset: 36039970 
     Type: TIFF 
     Entries: 
      NisoImageMetadata:

etc.

I don't (now) issue any TIFF calls from Write() apart from TIFFScanlineSize(m_tiff) and TIFFWriteEncodedStrip().

I tried issuing another TIFFWriteDirectory call just before I called TIFFClose, just that resulted in a TIFF that I could read in my code without any issues, but when I tried to validate it using jHove I got:

C:\Users\amonra\jhove>jhove "C:\Users\amonra\Documents\Astrophotography\DSS Test Images\Covington\TestImages\Bias\MasterOffset_ISO200.tif" | more 
Jhove (Rel. 1.26.1, 2022-07-14) 
Date: 2023-04-13 10:27:10 BST 
RepresentationInformation: C:\Users\amonra\Documents\Astrophotography\DSS Test Images\Covington\TestImages\Bias\MasterOffset_ISO200.tif 
  ReportingModule: BYTESTREAM, Rel. 1.4 (2018-10-01) 
  LastModified: 2023-04-13 10:26:44 BST 
  Size: 36039970 
  Format: bytestream 
  Status: Well-Formed and valid 
  SignatureMatches: 
   TIFF-hul 
  MIMEtype: application/octet-stream

Or if I specified -m TIFF-hul

:\Users\amonra\jhove>jhove -m TIFF-hul "C:\Users\amonra\Documents\Astrophotography\DSS Test Images\Covington\TestImages\Bias\MasterOffset_ISO200.tif" 
| more 
hove (Rel. 1.26.1, 2022-07-14) 
Date: 2023-04-13 10:30:14 BST 
RepresentationInformation: C:\Users\amonra\Documents\Astrophotography\DSS Test Images\Covington\TestImages\Bias\MasterOffset_ISO200.tif 
ReportingModule: TIFF-hul, Rel. 1.9.3 (2022-04-22) 
LastModified: 2023-04-13 10:26:44 BST 
Size: 36039970 
Format: TIFF 
Version: 6.0 
Status: Not well-formed 
SignatureMatches: 
  TIFF-hul 
InfoMessage: Unknown TIFF IFD tag: 340 
  ID: TIFF-HUL-12 
  Offset: 222 
InfoMessage: Unknown TIFF IFD tag: 341 
  ID: TIFF-HUL-12 
  Offset: 234 
InfoMessage: Unknown TIFF IFD tag: 50002 
  ID: TIFF-HUL-12 
  Offset: 282 
InfoMessage: Unknown TIFF IFD tag: 50006 
  ID: TIFF-HUL-12 
  Offset: 294 
InfoMessage: Unknown TIFF IFD tag: 50007 
  ID: TIFF-HUL-12 
  Offset: 306 
InfoMessage: Unknown TIFF IFD tag: 50008 
  ID: TIFF-HUL-12 
  Offset: 318 
InfoMessage: Unknown TIFF IFD tag: 50009 
  ID: TIFF-HUL-12 
  Offset: 330 
InfoMessage: Unknown TIFF IFD tag: 50010 
  ID: TIFF-HUL-12 
  Offset: 342 
ErrorMessage: Unknown data type: Type = 30068, Tag = 25449 
  ID: TIFF-HUL-3 
  Offset: 422 
ErrorMessage: Unknown data type: Type = 8307, Tag = 25970 
  ID: TIFF-HUL-3 
  Offset: 434 
ErrorMessage: Tag 19752 out of sequence 
  ID: TIFF-HUL-2 
  Offset: 444 
ErrorMessage: Unknown data type: Type = 25701, Tag = 19752 
  ID: TIFF-HUL-3 
  Offset: 446 
ErrorMessage: Unknown data type: Type = 10606, Tag = 24937 
  ID: TIFF-HUL-3 
  Offset: 458 
ErrorMessage: Tag 0 out of sequence 
  ID: TIFF-HUL-2

How can I get that root IFD to be at the start of the file please?

Thanks, David