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I have been trying to examine a JPEG file, known to contain IPTC data, but could notice no strings whatsoever. I tried the well known UNIX strings command, ASCII, 8-bit, 16-bit Unicode --- to no avail: I could not see any strings that I expect to find in IPTC fields.

My question is: How is IPTC data encoded? Is it encrypted? Compressed? Other? Why can't it be viewed using the strings command?

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无法使用十六进制查看器查看 IPTC 数据的最可能原因是它没有 IPTC 数据。

包含 IPTC 数据的图像，如下所示：

http://regex.info/exif.cgi?dummy=on&imgurl=https%3A%2F%2Fwww.iptc.org%2Fstd%2Fphotometadata%2Fexamples%2FIPTC-PhotometadataRef-Std2014_large.jpg

具有 XML 结构和文本字段，可通过 Emacs（8 位，甚至 Unicode）等文本编辑器查看。

于 2016-02-01T11:53:09.620 回答