In fact using full iDCT decoding you can see where the white block has been detected as someone has edited the image in a rather amature way.
JPEGsnoop 1.4.1 by Calvin Hass
http://www.impulseadventure.com/photo/
-------------------------------------
Filename: [C:\WINDOWS\Desktop\Original.jpg]
Filesize: [116906] Bytes
Start Offset: 0x00000000
*** Marker: SOI (xFFD8) ***
OFFSET: 0x00000000
*** Marker: APP0 (xFFE0) ***
OFFSET: 0x00000002
length = 16
identifier = [JFIF]
version = [1.1]
density = 72 x 72 DPI (dots per inch)
thumbnail = 0 x 0
*** Marker: APP13 (xFFED) ***
OFFSET: 0x00000014
length = 28
Identifier = [Photoshop 3.0]
8BIM: [0x0404] Name=[] Len=[0x0000]
IPTC [0xFFDB] Record Version = [0x0302]
*** Marker: DQT (xFFDB) ***
Define a Quantization Table.
OFFSET: 0x00000032
Table length = 67
----
Precision=8 bits
Destination ID=0 (Luminance)
DQT, Row #0: 3 2 2 3 4 6 8 10
DQT, Row #1: 2 2 2 3 4 9 10 9
DQT, Row #2: 2 2 3 4 6 9 11 9
DQT, Row #3: 2 3 4 5 8 14 13 10
DQT, Row #4: 3 4 6 9 11 17 16 12
DQT, Row #5: 4 6 9 10 13 17 18 15
DQT, Row #6: 8 10 12 14 16 19 19 16
DQT, Row #7: 12 15 15 16 18 16 16 16
Approx quality factor = 91.86 (scaling=16.28 variance=1.13)
*** Marker: DQT (xFFDB) ***
Define a Quantization Table.
OFFSET: 0x00000077
Table length = 67
----
Precision=8 bits
Destination ID=1 (Chrominance)
DQT, Row #0: 3 3 4 8 16 16 16 16
DQT, Row #1: 3 3 4 11 16 16 16 16
DQT, Row #2: 4 4 9 16 16 16 16 16
DQT, Row #3: 8 11 16 16 16 16 16 16
DQT, Row #4: 16 16 16 16 16 16 16 16
DQT, Row #5: 16 16 16 16 16 16 16 16
DQT, Row #6: 16 16 16 16 16 16 16 16
DQT, Row #7: 16 16 16 16 16 16 16 16
Approx quality factor = 91.90 (scaling=16.20 variance=0.15)
*** Marker: SOF0 (Baseline DCT) (xFFC0) ***
OFFSET: 0x000000BC
Frame header length = 17
Precision = 8
Number of Lines = 600
Samples per Line = 800
Image Size = 800 x 600
Raw Image Orientation = Landscape
Number of Img components = 3
Component[1]: ID=0x01, Samp Fac=0x22 (Subsamp 1 x 1), Quant Tbl Sel=0x00 (Lum: Y)
Component[2]: ID=0x02, Samp Fac=0x11 (Subsamp 2 x 2), Quant Tbl Sel=0x01 (Chrom: Cb)
Component[3]: ID=0x03, Samp Fac=0x11 (Subsamp 2 x 2), Quant Tbl Sel=0x01 (Chrom: Cr)
*** Marker: DHT (Define Huffman Table) (xFFC4) ***
OFFSET: 0x000000CF
Huffman table length = 29
----
Destination ID = 0
Class = 0 (DC / Lossless Table)
Codes of length 01 bits (000 total):
Codes of length 02 bits (002 total): 01 02
Codes of length 03 bits (003 total): 00 03 04
Codes of length 04 bits (001 total): 05
Codes of length 05 bits (001 total): 06
Codes of length 06 bits (001 total): 08
Codes of length 07 bits (001 total): 07
Codes of length 08 bits (001 total): 09
Codes of length 09 bits (000 total):
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: 010
*** Marker: DHT (Define Huffman Table) (xFFC4) ***
OFFSET: 0x000000EE
Huffman table length = 76
----
Destination ID = 0
Class = 1 (AC Table)
Codes of length 01 bits (000 total):
Codes of length 02 bits (002 total): 01 02
Codes of length 03 bits (001 total): 03
Codes of length 04 bits (003 total): 00 04 11
Codes of length 05 bits (003 total): 05 12 21
Codes of length 06 bits (002 total): 31 41
Codes of length 07 bits (004 total): 13 22 51 61
Codes of length 08 bits (005 total): 06 14 32 71 81
Codes of length 09 bits (001 total): 91
Codes of length 10 bits (006 total): 07 15 23 42 A1 B1
Codes of length 11 bits (004 total): 08 52 C1 D1
Codes of length 12 bits (005 total): 24 33 62 E1 F0
Codes of length 13 bits (002 total): 72 82
Codes of length 14 bits (004 total): 09 43 92 F1
Codes of length 15 bits (000 total):
Codes of length 16 bits (015 total): 16 17 34 A2 18 25 27 53 C2 26 45 54 73 A3 B2
Total number of codes: 057
*** Marker: DHT (Define Huffman Table) (xFFC4) ***
OFFSET: 0x0000013C
Huffman table length = 28
----
Destination ID = 1
Class = 0 (DC / Lossless Table)
Codes of length 01 bits (000 total):
Codes of length 02 bits (003 total): 00 01 02
Codes of length 03 bits (001 total): 03
Codes of length 04 bits (001 total): 04
Codes of length 05 bits (001 total): 05
Codes of length 06 bits (001 total): 06
Codes of length 07 bits (001 total): 07
Codes of length 08 bits (001 total): 08
Codes of length 09 bits (000 total):
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: 009
*** Marker: DHT (Define Huffman Table) (xFFC4) ***
OFFSET: 0x0000015A
Huffman table length = 64
----
Destination ID = 1
Class = 1 (AC Table)
Codes of length 01 bits (000 total):
Codes of length 02 bits (002 total): 00 01
Codes of length 03 bits (002 total): 02 11
Codes of length 04 bits (001 total): 21
Codes of length 05 bits (003 total): 03 12 31
Codes of length 06 bits (002 total): 04 41
Codes of length 07 bits (004 total): 05 13 22 51
Codes of length 08 bits (003 total): 06 61 71
Codes of length 09 bits (005 total): 32 81 91 A1 B1
Codes of length 10 bits (007 total): 07 42 C1 D1 E1 F0 F1
Codes of length 11 bits (003 total): 14 23 52
Codes of length 12 bits (001 total): 15
Codes of length 13 bits (008 total): 16 17 25 33 34 62 72 92
Codes of length 14 bits (003 total): 35 43 44
Codes of length 15 bits (001 total): A2
Codes of length 16 bits (000 total):
Total number of codes: 045
*** Marker: SOS (Start of Scan) (xFFDA) ***
OFFSET: 0x0000019C
Scan header length = 12
Number of img components = 3
Component[1]: selector=0x01, table=0x00
Component[2]: selector=0x02, table=0x11
Component[3]: selector=0x03, table=0x11
Spectral selection = 0 .. 63
Successive approximation = 0x00
*** Decoding SCAN Data ***
OFFSET: 0x000001AA
Scan Decode Mode: Full IDCT (AC + DC)
Scan Data encountered marker 0xFFD9 @ 0x0001C8A8.0
*** NOTE: YCC Clipped. MCU=( 17, 27) YCC=( 257, 117, 127) Y Overflow @ Offset 0x0001C8A7.6
*** NOTE: YCC Clipped. MCU=( 12, 27) YCC=( 256, 114, 129) Y Overflow @ Offset 0x0001C8A7.6
*** NOTE: YCC Clipped. MCU=( 14, 27) YCC=( 256, 117, 127) Y Overflow @ Offset 0x0001C8A7.6
*** NOTE: YCC Clipped. MCU=( 15, 27) YCC=( 256, 116, 127) Y Overflow @ Offset 0x0001C8A7.6
*** NOTE: YCC Clipped. MCU=( 17, 27) YCC=( 257, 117, 126) Y Overflow @ Offset 0x0001C8A7.6
*** NOTE: YCC Clipped. MCU=( 17, 27) YCC=( 258, 119, 126) Y Overflow @ Offset 0x0001C8A7.6
*** NOTE: YCC Clipped. MCU=( 16, 27) YCC=( 257, 118, 127) Y Overflow @ Offset 0x0001C8A7.6
*** NOTE: YCC Clipped. MCU=( 16, 27) YCC=( 256, 111, 126) Y Overflow @ Offset 0x0001C8A7.6
Compression stats:
Compression Ratio: 12.36:1
Bits per pixel: 1.94:1
Huffman code histogram stats:
Huffman Table: (Dest ID: 0, Class: DC)
# codes of length 01 bits: 0 ( 0%)
# codes of length 02 bits: 3182 ( 42%)
# codes of length 03 bits: 3058 ( 40%)
# codes of length 04 bits: 867 ( 11%)
# codes of length 05 bits: 267 ( 4%)
# codes of length 06 bits: 121 ( 2%)
# codes of length 07 bits: 87 ( 1%)
# codes of length 08 bits: 18 ( 0%)
# codes of length 09 bits: 0 ( 0%)
# codes of length 10 bits: 0 ( 0%)
# codes of length 11 bits: 0 ( 0%)
# codes of length 12 bits: 0 ( 0%)
# codes of length 13 bits: 0 ( 0%)
# codes of length 14 bits: 0 ( 0%)
# codes of length 15 bits: 0 ( 0%)
# codes of length 16 bits: 0 ( 0%)
Huffman Table: (Dest ID: 1, Class: DC)
# codes of length 01 bits: 0 ( 0%)
# codes of length 02 bits: 2823 ( 74%)
# codes of length 03 bits: 495 ( 13%)
# codes of length 04 bits: 256 ( 7%)
# codes of length 05 bits: 92 ( 2%)
# codes of length 06 bits: 67 ( 2%)
# codes of length 07 bits: 47 ( 1%)
# codes of length 08 bits: 20 ( 1%)
# codes of length 09 bits: 0 ( 0%)
# codes of length 10 bits: 0 ( 0%)
# codes of length 11 bits: 0 ( 0%)
# codes of length 12 bits: 0 ( 0%)
# codes of length 13 bits: 0 ( 0%)
# codes of length 14 bits: 0 ( 0%)
# codes of length 15 bits: 0 ( 0%)
# codes of length 16 bits: 0 ( 0%)
Huffman Table: (Dest ID: 0, Class: AC)
# codes of length 01 bits: 0 ( 0%)
# codes of length 02 bits: 68190 ( 46%)
# codes of length 03 bits: 19129 ( 13%)
# codes of length 04 bits: 32659 ( 22%)
# codes of length 05 bits: 14270 ( 10%)
# codes of length 06 bits: 5723 ( 4%)
# codes of length 07 bits: 5033 ( 3%)
# codes of length 08 bits: 2634 ( 2%)
# codes of length 09 bits: 315 ( 0%)
# codes of length 10 bits: 930 ( 1%)
# codes of length 11 bits: 323 ( 0%)
# codes of length 12 bits: 157 ( 0%)
# codes of length 13 bits: 34 ( 0%)
# codes of length 14 bits: 41 ( 0%)
# codes of length 15 bits: 0 ( 0%)
# codes of length 16 bits: 35 ( 0%)
Huffman Table: (Dest ID: 1, Class: AC)
# codes of length 01 bits: 0 ( 0%)
# codes of length 02 bits: 10059 ( 49%)
# codes of length 03 bits: 5458 ( 26%)
# codes of length 04 bits: 1052 ( 5%)
# codes of length 05 bits: 2312 ( 11%)
# codes of length 06 bits: 578 ( 3%)
# codes of length 07 bits: 580 ( 3%)
# codes of length 08 bits: 273 ( 1%)
# codes of length 09 bits: 218 ( 1%)
# codes of length 10 bits: 150 ( 1%)
# codes of length 11 bits: 28 ( 0%)
# codes of length 12 bits: 4 ( 0%)
# codes of length 13 bits: 21 ( 0%)
# codes of length 14 bits: 3 ( 0%)
# codes of length 15 bits: 1 ( 0%)
# codes of length 16 bits: 0 ( 0%)
YCC clipping in DC:
Y component: [<0= 0] [>255= 0]
Cb component: [<0= 0] [>255= 0]
Cr component: [<0= 0] [>255= 0]
YCC histogram in DC (DCT sums : pre-ranged:
Y component histo: [min= -944 max= 1042 avg= -12.6]
Cb component histo: [min= -407 max= 385 avg= 13.4]
Cr component histo: [min= -387 max= 276 avg= -143.2]
YCC histogram in DC:
Y component histo: [min= 0 max= 258 avg= 126.0]
Cb component histo: [min= 0 max= 176 avg= 129.2]
Cr component histo: [min= 0 max= 162 avg= 109.7]
RGB histogram in DC (before clip):
R component histo: [min= -2 max= 274 avg= 99.8]
G component histo: [min= 0 max= 264 avg= 138.2]
B component histo: [min= -32 max= 266 avg= 127.7]
RGB clipping in DC:
R component: [<0= 0] [>255= 0]
G component: [<0= 0] [>255= 0]
B component: [<0= 0] [>255= 0]
RGB histogram in DC (after clip):
R component histo: [min= 0 max= 255 avg= 99.8]
G component histo: [min= 0 max= 255 avg= 138.2]
B component histo: [min= 0 max= 255 avg= 127.8]
Brightest Pixel Search:
YCC=[ 1042, -65, -10] RGB=[252,255,239] @ MCU[ 17, 27]
Finished Decoding SCAN Data
Number of RESTART markers decoded: 0
Next position in scan buffer: Offset 0x0001C8A7.6
*** Marker: EOI (End of Image) (xFFD9) ***
OFFSET: 0x0001C8A8
*** Searching Compression Signatures ***
Signature: 01557A9AE226A38386271DFE13D64298
Signature (Rotated): 0167FCEDBA3A8E8CF822163DB3564762
File Offset: 0 bytes
Chroma subsampling: 2x2
EXIF Make/Model: NONE
EXIF Makernotes: NONE
EXIF Software: NONE
Searching Compression Signatures: (3327 built-in, 0 user(*) )
EXIF.Make / Software EXIF.Model Quality Subsamp Match?
------------------------- ----------------------------------- ---------------- --------------
CAM:[Konica Minolta Camera, In] [DiMAGE Z2 ] [ ] No
CAM:[Minolta Co., Ltd. ] [DiMAGE F100 ] [ ] No
CAM:[NIKON ] [E2500 ] [FINE ] No
CAM:[NIKON ] [E4500 ] [FINE ] No
CAM:[NIKON ] [E5000 ] [FINE ] No
CAM:[NIKON ] [E8700 ] [FINE ] No
CAM:[NIKON ] [E885 ] [FINE ] No
CAM:[OLYMPUS CORPORATION ] [C8080WZ ] [ ] No
CAM:[OLYMPUS OPTICAL CO.,LTD ] [C2000Z ] [ ] No
CAM:[OLYMPUS OPTICAL CO.,LTD ] [C3040Z ] [ ] No
CAM:[SEIKO EPSON CORP. ] [PhotoPC 3000Z ] [ ] No
CAM:[SONY ] [DSC-H2 ] [ ] No
CAM:[SONY ] [DSC-H7 ] [ ] No
CAM:[SONY ] [DSC-H9 ] [ ] No
CAM:[SONY ] [DSC-P200 ] [ ] No
CAM:[SONY ] [DSC-S90 ] [ ] No
CAM:[SONY ] [DSC-W7 ] [ ] No
SW :[IJG Library ] [092 ]
The following IJG-based editors also match this signature:
SW :[GIMP ] [092 ]
SW :[IrfanView ] [092 ]
SW :[idImager ] [092 ]
SW :[FastStone Image Viewer ] [092 ]
SW :[NeatImage ] [092 ]
SW :[Paint.NET ] [092 ]
SW :[Photomatix ] [092 ]
SW :[XnView ] [092 ]
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]