Gary Lucas created IMAGING-258:
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Summary: TiffReader.readDirectories() fails on EXIF data
Key: IMAGING-258
URL: https://issues.apache.org/jira/browse/IMAGING-258
Project: Commons Imaging
Issue Type: Bug
Components: Format: TIFF
Affects Versions: 1.0-alpha1
Reporter: Gary Lucas
When reading a TIFF directory that contains an EXIF sub directory, the
TiffReader class throws an ImageReadException stating that "ExifOffset has
incorrect type IFD".
This exception occurs in the TiffReader.readDirectories() call which attempts
to read all IFD's (directories) in a TIFF file. It can be avoided by calling
TiffReader.readFirstDirectory(). Of course, if you do that, you will not be
able to access the EXIF elements.
This happens when accessing the TIFF element with TIFF Tag 0x8769. I suspect
that it could also happen with TIFF files containing GPS extensions, Tag 0x8825.
I've gotten this issue with GeoTIFF files from a couple of different sources.
The one I'd recommend for testing would be the public-domain "Natural Earth
Data" medium-size Cross-blended Hypsometric Tints file at
[https://www.naturalearthdata.com/downloads/10m-raster-data/10m-cross-blend-hypso/]
I am not experienced with the EXIF sub-directory specification and do not yet
have a good sense of what the level of effort for a fix would be.
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