我有一张JPEG图片，在任何程序中都无法打开：
在Ubuntu图像查看器中打开会产生以下结果：
将照片通过convert转换会得到类似的结果：
$ convert corrupt.jpg out.jpg
convert.im6: Bogus Huffman table definition `corrupt.jpg' @ error/jpeg.c/JPEGErrorHandler/316.
convert.im6: no images defined `out.jpg' @ error/convert.c/ConvertImageCommand/3044.
使用exiftool运行照片会得到：
ExifTool Version Number : 9.46
File Name : corrupt.jpg
Directory : .
File Size : 47 kB
File Modification Date/Time : 2015:04:11 01:31:14-07:00
File Access Date/Time : 2018:05:04 10:26:04-07:00
File Inode Change Date/Time : 2018:05:04 10:26:03-07:00
File Permissions : r--------
File Type : JPEG
MIME Type : image/jpeg
Comment : Y�.�.�..2..Q.Q.
Image Width : 640
Image Height : 480
Encoding Process : Baseline DCT, Huffman coding
Bits Per Sample : 8
Color Components : 3
Y Cb Cr Sub Sampling : YCbCr4:2:2 (2 1)
Image Size : 640x480
未被破坏的照片包含相似的图像内容，平均大小为45-48k，因此我认为照片数据本身就在这个JPEG文件中。我将照片托管在S3上，您可以使用wget下载它：wget https://s3.amazonaws.com/jordanarseno.com/corrupt.jpg。我用hexedit打开文件并发现以下信息：
- 前几百字节之外的照片内容是随机分布的，足以表明它包含一张图片，即我没有看到连续的0或F流。 - 它确实以FF D8文件标志开头，正如JPEG应该的那样。 - 接下来的两个字节不是FF E0或FF E1，就像文件签名列表所说的应该对应于JPEG或JFIF。相反，它是FF FE。但是，在表格中列出了这个值，但是被列为：
字节顺序标记，用于以小端16位Unicode传输格式编码的文本文件
在
FF FE之后不久，我看到的字节的ASCII表示为：&'()*456789:CDEFGHIJSTUVWXYZcdefghijstuvwxyz。对于JPEG来说似乎相当奇怪。这是什么？同样，大约100个字节之后出现了ASCII字符串
&'()*56789:CDEFGHIJSTUVWXYZcdefghijstuvwxyz。FF D9（JPEG终止符字符串）确实在文件中，但是在此终止符之后确实出现了字符：FF D9 5C 72 78 E0 7C 94 CD B2 9C FF 00 C4 BF 53 C0 E7 FE 41 D3 9C FF 00 E3 95 7C F1 B6 92 5F 7A 2B EB 54 AF BF E6 30 FD A0 7F CC 3B 53 E9 FF 00 40 F9 FF 00 F8 8A 4D F7 08 30
切换到Windows并使用JPEGsnoop：
JPEGsnoop 1.8.0 by Calvin Hass
http://www.impulseadventure.com/photo/
-------------------------------------
Filename: [C:\corrupt.jpg]
Filesize: [47760] Bytes
Start Offset: 0x00000000
*** Marker: SOI (xFFD8) ***
OFFSET: 0x00000000
*** Marker: COM (Comment) (xFFFE) ***
OFFSET: 0x00000002
Comment length = 36
Comment=Y.Ò................à.....2..Q.Q...
*** Marker: DQT (xFFDB) ***
Define a Quantization Table.
OFFSET: 0x00000028
Table length = 132
----
Precision=8 bits
Destination ID=0 (Luminance)
DQT, Row #0: 3 2 2 3 4 7 9 10
DQT, Row #1: 2 2 2 3 4 10 10 9
DQT, Row #2: 2 2 3 4 7 10 12 10
DQT, Row #3: 2 3 4 5 9 15 14 11
DQT, Row #4: 3 4 6 10 12 19 18 13
DQT, Row #5: 4 6 9 11 14 18 19 16
DQT, Row #6: 8 11 13 15 18 21 21 17
DQT, Row #7: 12 16 16 17 19 17 18 17
Approx quality factor = 91.45 (scaling=17.09 variance=0.95)
----
Precision=8 bits
Destination ID=1 (Chrominance)
DQT, Row #0: 3 3 4 8 17 17 17 17
DQT, Row #1: 3 4 4 11 17 17 17 17
DQT, Row #2: 4 4 10 17 17 17 17 17
DQT, Row #3: 8 11 17 17 17 17 17 17
DQT, Row #4: 17 17 17 17 17 17 17 17
DQT, Row #5: 17 17 17 17 17 17 17 17
DQT, Row #6: 17 17 17 17 17 17 17 17
DQT, Row #7: 17 17 17 17 17 17 17 17
Approx quality factor = 91.44 (scaling=17.11 variance=0.19)
*** Marker: COM (Comment) (xFFFE) ***
OFFSET: 0x000000AE
Comment length = 5
Comment=...
*** Marker: SOF0 (Baseline DCT) (xFFC0) ***
OFFSET: 0x000000B5
Frame header length = 17
Precision = 8
Number of Lines = 480
Samples per Line = 640
Image Size = 640 x 480
Raw Image Orientation = Landscape
Number of Img components = 3
Component[1]: ID=0x01, Samp Fac=0x21 (Subsamp 1 x 1), Quant Tbl Sel=0x00 (Lum: Y)
Component[2]: ID=0x02, Samp Fac=0x11 (Subsamp 2 x 1), Quant Tbl Sel=0x01 (Chrom: Cb)
Component[3]: ID=0x03, Samp Fac=0x11 (Subsamp 2 x 1), Quant Tbl Sel=0x01 (Chrom: Cr)
*** Marker: DHT (Define Huffman Table) (xFFC4) ***
OFFSET: 0x000000C8
Huffman table length = 418
----
Destination ID = 0
Class = 0 (DC / Lossless Table)
Codes of length 01 bits (000 total):
Codes of length 02 bits (001 total): 00
Codes of length 03 bits (005 total): 01 02 03 04 05
Codes of length 04 bits (001 total): 06
Codes of length 05 bits (001 total): 07
Codes of length 06 bits (001 total): 08
Codes of length 07 bits (001 total): 09
Codes of length 08 bits (001 total): 0A
Codes of length 09 bits (001 total): 0B
Codes of length 10 bits (000 total):
Codes of length 11 bits (000 total):
Codes of length 12 bits (000 total):
Codes of length 13 bits (000 total):
Codes of length 14 bits (000 total):
Codes of length 15 bits (000 total):
Codes of length 16 bits (000 total):
Total number of codes: 012
----
Destination ID = 1
Class = 0 (DC / Lossless Table)
Codes of length 01 bits (000 total):
Codes of length 02 bits (003 total): 13 0E 0F
Codes of length 03 bits (001 total): 10
Codes of length 04 bits (001 total): 11
Codes of length 05 bits (001 total): 12
Codes of length 06 bits (001 total): 12
Codes of length 07 bits (012 total): 12 0B 0D 13 15 13 11 15 10 11 12 11
Codes of length 08 bits (016 total): 01 03 03 03 04 04 04 08 04 04 08 11 0B 0A 0B 11
Codes of length 09 bits (013 total): 11 11 11 11 11 11 11 11 11 11 11 11 11
Codes of length 10 bits (011 total): 11 11 11 11 11 11 11 11 11 11 11
Codes of length 11 bits (012 total): 11 11 11 11 11 11 11 11 11 11 11 01
Codes of length 12 bits (015 total): 01 01 01 01 00 00 00 00 00 00 01 02 03 04 05
Codes of length 13 bits (012 total): 06 07 08 09 0A 0B 10 00 02 01 03 03
Codes of length 14 bits (009 total): 02 04 03 05 05 04 04 00 00
Codes of length 15 bits (010 total): 01 7D 01 02 03 00 04 11 05 12
Codes of length 16 bits (014 total): 21 31 41 06 13 51 61 07 22 71 14 32 81 91
Total number of codes: 131
----
Destination ID = 1
Class = 10 (AC Table)
ERROR: Invalid DHT Class (10). Aborting DHT Load.
ERROR: Expected marker 0xFF, got 0x73 @ offset 0x0000026C. Consider using [Tools->Img Search Fwd/Rev].
*** Searching Compression Signatures ***
Signature: 01FF5BA518B453CC8F224A4C85505196
Signature (Rotated): 01D13AFD01FF0B6EC46EA4081D25BB4D
File Offset: 0 bytes
Chroma subsampling: 2x1
EXIF Make/Model: NONE
EXIF Makernotes: NONE
EXIF Software: NONE
Searching Compression Signatures: (3347 built-in, 0 user(*) )
EXIF.Make / Software EXIF.Model Quality Subsamp Match?
------------------------- ----------------------------------- ---------------- --------------
CAM:[NIKON ] [NIKON D40 ] [FINE ] Yes
Based on the analysis of compression characteristics and EXIF metadata:
ASSESSMENT: Class 1 - Image is processed/edited
This may be a new software editor for the database.
If this file is processed, and editor doesn't appear in list above,
PLEASE ADD TO DATABASE with [Tools->Add Camera to DB]
*** Additional Info ***
NOTE: Data exists after EOF, range: 0x00000000-0x0000BA90 (47760 bytes)
作为最后的说明，JPEGSnoop识别出来的{{EXIF.Model}}是错误的。这张照片应该是用{{VC0706 UART Model: LCF - 23T 0V528}}拍摄的。
总结一下：这个JPEG文件能恢复吗？
