facebook - IPTC 元数据自动添加到 Facebook 上传的图片中

Question

许多上传到 Facebook 的图片包含 IPTC/IIM 字段，这些字段显然是在上传过程中自动添加的:

• 特殊指令，以“FBMD”开头的字符串
• 原始传输引用。

例如，查看上传到 Facebook 并使用 Jeffrey 的 Exif Viewer 解码的这张(个人)图像: http://exif.regex.info/exif.cgi

这是什么？

Answer 1

根据 this site :

Special Instructions [IPTC Core] Alternative label from older IPTC IIM schema, used for "Instructions."

Instructions [IPTC Core] This is a simple text field that can include any of a number of instructions from the provider or creator to the receiver of the photograph. Any of the following might be included: embargoes (eg: News Magazines OUT) and other restrictions not covered by the Rights Usage Terms field (or new PLUS rights related fields); information regarding the original means of capture (scanning notes, color profile, etc.) or other specific text information the user may need for accurate reproduction; additional permissions or credits required when publishing. Note: This field is “shared” with the “Instructions” field in the Origin panel of the Adobe Photoshop File Info dialogue.

Examples: *Image to be used one time only, non-exclusive in English-language-edition magazine as inside image, no larger than a full page in color. Additional third-party rights to be negotiated with Julie Doe / XYZ Agency in advance. All rights not specifically granted are reserved. See delivery memo for specific license.

For consideration only; no reproduction in any form without prior, written permission.*

那是 International Press Telecommunications Council (IPTC)标准Information Interchange Model (IIM) .

我无法解码 Facebook 的数据，但粘贴、下载和再次粘贴图像会稍微改变数据。

使用 IrfanView 将特殊指令设置为在没有 IPTC 数据的 JPG 中“测试”，将这些字节添加到标题中:

我在 FBMD 之后下载了 339 张指令长度为 94 的图像，并且以下字节保持不变:

0 {'0': 339}
1 {'1': 339}
2 {'0': 339}
3 {'0': 339}
4 {'0': 339}
5 {'a': 339}
8 {'0': 339}
9 {'3': 339}
10 {'0': 339}
11 {'0': 339}
12 {'0': 339}
13 {'0': 339}
18 {'0': 339}
19 {'0': 339}
20 {'0': 339}
21 {'0': 339}
26 {'0': 339}
27 {'0': 339}
28 {'0': 339}
29 {'0': 339}
34 {'0': 339}
35 {'0': 339}
36 {'0': 339}
37 {'0': 339}
42 {'0': 339}
43 {'0': 339}
44 {'0': 339}
45 {'0': 339}
50 {'0': 339}
52 {'0': 339}
53 {'0': 339}
58 {'0': 339}
60 {'0': 339}
61 {'0': 339}
66 {'0': 339}
68 {'0': 339}
69 {'0': 339}
74 {'0': 339}
76 {'0': 339}
77 {'0': 339}
82 {'0': 339}
84 {'0': 339}
85 {'0': 339}
90 {'0': 339}
92 {'0': 339}
93 {'0': 339}

我还在 FBMD 之后发现了 3 张只有 86 个神秘字节的图像，例如23000986030000f91d0000e5230000502900004889000041ac000004c900007aee0000cf0f0100f02d0100，也是前几个月保存的。相同的字节有:

0 {'2': 3}
1 {'3': 3}
2 {'0': 3}
3 {'0': 3}
4 {'0': 3}
5 {'9': 3}
6 {'8': 3}
8 {'0': 3}
9 {'3': 3}
10 {'0': 3}
11 {'0': 3}
12 {'0': 3}
13 {'0': 3}
16 {'1': 3}
18 {'0': 3}
19 {'0': 3}
20 {'0': 3}
21 {'0': 3}
26 {'0': 3}
27 {'0': 3}
28 {'0': 3}
29 {'0': 3}
34 {'0': 3}
35 {'0': 3}
36 {'0': 3}
37 {'0': 3}
42 {'0': 3}
43 {'0': 3}
44 {'0': 3}
45 {'0': 3}
50 {'0': 3}
51 {'0': 3}
52 {'0': 3}
53 {'0': 3}
58 {'0': 3}
59 {'0': 3}
60 {'0': 3}
61 {'0': 3}
66 {'0': 3}
67 {'0': 3}
68 {'0': 3}
69 {'0': 3}
74 {'0': 3}
76 {'0': 3}
77 {'0': 3}
82 {'0': 3}
84 {'0': 3}
85 {'0': 3}
86 {'\x00': 3}

This blog post似乎对它了解更多:

[...] on 2014-11-13, Facebook introduced a new tracking code. It appears as an IPTC Special Instructions metadata field. They look like:

Special Instructions: FBMD01000ac60300004a1d00002d4b000067580000c9650000d5fc000054350100953a0100d3420100e84b01005f8f0100

Special Instructions: FBMD23000969010000b1590000cb7700000a8600000c07010046820100b8c0010052590200e5c902006e440300

I think that "FBMD" stands for "Facebook Member Data" (but I could be wrong).

I've manged to decode one interesting aspect in these strings: the length. Each string starts with "FBMD", two hex characters (1 bytes), and a 16-byte (4-character) length. Then comes length+1 sets of 32-bit (8-byte) values.

FBMD01 000a = length 10, so expect 11 fields: c6030000 4a1d0000 2d4b0000 67580000 c9650000 d5fc0000 54350100 953a0100 d3420100 e84b0100 5f8f0100

FBMD23 0009 = length 9, so expect 10 fields: 69010000 b1590000 cb770000 0a860000 0c070100 46820100 b8c00100 52590200 e5c90200 6e440300

我已经 asked the Facebook community关于它。