Am 28.01.2016 um 07:45 schrieb Matthias Bodenbinder:
> I just found that this already was a bug report with DT version 1.2! Status 
> changed from Triaged to Fixed over 1 year ago.
> 
> "exported TIFF missing ImageLength field, incompatible with ImageMagick 
> identify command"
> http://redmine.darktable.org/issues/8473
> 
> Somehow this issue seems to be back. According to this bug report I tested 
> with "convert" and got:
> 
> 1# convert IMG_2542.tif test.png
> convert: Unknown field with tag 18246 (0x4746) encountered. 
> `TIFFReadDirectory' @ warning/tiff.c/TIFFWarnings/861.
> convert: Unknown field with tag 18249 (0x4749) encountered. 
> `TIFFReadDirectory' @ warning/tiff.c/TIFFWarnings/861.
> convert: Unknown field with tag 36867 (0x9003) encountered. 
> `TIFFReadDirectory' @ warning/tiff.c/TIFFWarnings/861.
> convert: Unknown field with tag 34864 (0x8830) encountered. 
> `TIFFReadCustomDirectory' @ warning/tiff.c/TIFFWarnings/861.
> convert: Unknown field with tag 34866 (0x8832) encountered. 
> `TIFFReadCustomDirectory' @ warning/tiff.c/TIFFWarnings/861.
> convert: Unknown field with tag 40965 (0xa005) encountered. 
> `TIFFReadCustomDirectory' @ warning/tiff.c/TIFFWarnings/861.
> convert: Unknown field with tag 42032 (0xa430) encountered. 
> `TIFFReadCustomDirectory' @ warning/tiff.c/TIFFWarnings/861.
> convert: Unknown field with tag 42033 (0xa431) encountered. 
> `TIFFReadCustomDirectory' @ warning/tiff.c/TIFFWarnings/861.
> convert: Unknown field with tag 42034 (0xa432) encountered. 
> `TIFFReadCustomDirectory' @ warning/tiff.c/TIFFWarnings/861.
> convert: Unknown field with tag 42036 (0xa434) encountered. 
> `TIFFReadCustomDirectory' @ warning/tiff.c/TIFFWarnings/861.
> convert: Unknown field with tag 42037 (0xa435) encountered. 
> `TIFFReadCustomDirectory' @ warning/tiff.c/TIFFWarnings/861.
> convert: Unknown field with tag 18246 (0x4746) encountered. 
> `TIFFReadDirectory' @ warning/tiff.c/TIFFWarnings/861.
> convert: Unknown field with tag 18249 (0x4749) encountered. 
> `TIFFReadDirectory' @ warning/tiff.c/TIFFWarnings/861.
> convert: Unknown field with tag 36867 (0x9003) encountered. 
> `TIFFReadDirectory' @ warning/tiff.c/TIFFWarnings/861.
> 
> 
> Matthias
> 

Please check this page for field tag explanations:
http://www.digitalpreservation.gov/formats/content/tiff_tags.shtml

Matthias


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