[jira] [Updated] (IMAGING-180) strange offset of first Exif IFD value

["Paul Hartmann (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/IMAGING-180?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Paul Hartmann updated IMAGING-180:
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    Attachment: IMG_7250_small.JPG

> strange offset of first Exif IFD value
> --------------------------------------
>
>                 Key: IMAGING-180
>                 URL: https://issues.apache.org/jira/browse/IMAGING-180
>             Project: Commons Imaging
>          Issue Type: Bug
>          Components: Format: JPEG
>            Reporter: Paul Hartmann
>         Attachments: IMG_7250_small.JPG
>
>
> Adding GPS coordinates to a jpeg image creates a file with strange offset of first Exif IFD value.
> The following snippet is used to add the GPS metainfo:
> {code:java}
>     public static void main(String[] args) throws Exception {
>         final File inFile = new File("IMG_7250_small.JPG");
>         File outFile = new File("IMG_7250_small-output.JPG");
>         final TiffImageMetadata exif = ((JpegImageMetadata) Imaging.getMetadata(inFile)).getExif();
>         final TiffOutputSet outputSet = exif.getOutputSet();
>         outputSet.setGPSInDegrees(123, 34);
>         try (BufferedOutputStream os = new BufferedOutputStream(new FileOutputStream(outFile))) {
>             new ExifRewriter().updateExifMetadataLossless(inFile, os, outputSet);
>         }
>     }
> {code}
> Running {{jhead}} on the output file produces a warning:
> {code}
> $ jhead IMG_7250_small-output.JPG
> Nonfatal Error : 'IMG_7250_small-output.JPG' Suspicious offset of first Exif IFD value
> {code}
> Indeed, the offset should normally be 8 (as in the input file) but is 0x4a=74:
> {code}
> $ exiftool -v3 IMG_7250_small-output.JPG
> [...]
> JPEG APP1 (258 bytes):
>     0006: 45 78 69 66 00 00 49 49 2a 00 4a 00 00 00 05 00 [Exif..II*.J.....]
> {code}
> As far as I can tell, this offset is useless, wastes space and possibly breaks software that relies on the standard value "8".



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