[
https://issues.apache.org/jira/browse/IMAGING-180?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]
Paul Hartmann updated IMAGING-180:
----------------------------------
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".
--
This message was sent by Atlassian JIRA
(v6.3.4#6332)
