When browsing a bunch of pictures with Kuickshow, I always saw that all pictures were correctly oriented for display. The pictures that were taken by rotating the camera 90 degrees from its natural position were displayed by Kuickshow in the right orientation so that I did not have to re-orient the pictures manually. When I edited one of such pictures with the GIMP, the picture was displayed as it was, which was in the wrong orientation to be viewed.
Naturally, I reoriented the picture with the GIMP so that it could be easily viewed. I oriented it 90 degrees clock-wise. After saving the picture and quited the GIMP, I opened the picture again with Kuickshow. This time, however, Kuickshow displayed the picture in the wrong orientation so that I had to rotate it 270 degrees clock-wise by pressing `9', which is Kuickshow shortcut to rotate a picture 90 degrees clock-wise, three times. At this, I realized that there was a special field in the picture file format, which is a JPEG, that told Kuickshow the orientation of the picture when it was taken.
To correct this field, I opened the file with `vi', which naturally displayed the content of the file in hexadecimal view. Beside that, I also opened with `vi' in another tab of Konsole, another picture that was taken by the same camera in the natural position. Next, I performed a manual visual comparison of the contents of the files by switching from one tab to another tab pressing `alt + left arrow' and `alt + right arrow' back and forth. In the parts of the files that both `vi' displayed for the very first time, there was a single field at location 0x48 that altered from 0x01 to 0x06. I suspected this field to be the one that told Kuickshow how to orient the picture correctly for display because it was only one byte, which is suitable for use as flag. So, I changed 0x06 to 0x01, and I got it right. The picture was displayed correctly by Kuickshow.
Well, actually what I have done is a trade-off between reading the EXIF II meta-data specification and reverse-engineering the file format completely. However, getting the flag under three minutes had its own fun and was faster than searching the specification somewhere on the Internet. I showed the parts of the files that both `vi' displayed for the very first time below.
offset 0 1 2 3 4 5 6 7 8 9 a b c d e f 0123456789abcdef 00000000 d8 ff e0 00 10 4a 46 49 46 00 01 01 01 00 48 ÿØÿà..JFIF.....H 00000010 00 48 00 00 ff e1 48 18 45 78 69 66 00 00 49 49 .H..ÿáH.Exif..II 00000020 2a 00 08 00 00 00 09 00 0f 01 02 00 06 00 00 00 *............... 00000030 7a 00 00 00 10 01 02 00 17 00 00 00 80 00 00 00 z............... 00000040 12 01 03 00 01 00 00 00 01 00 00 00 1a 01 05 00 ................ 00000050 01 00 00 00 98 00 00 00 1b 01 05 00 01 00 00 00 ................ 00000060 a0 00 00 00 28 01 03 00 01 00 00 00 02 00 00 00 ...(........... 00000070 32 01 02 00 14 00 00 00 a8 00 00 00 13 02 03 00 2.......¨....... 00000080 01 00 00 00 02 00 00 00 69 87 04 00 01 00 00 00 ........i....... 00000090 bc 00 00 00 22 23 00 00 43 61 6e 6f 6e 00 43 61 ¼..."#..Canon.Ca 000000a0 6e 6f 6e 20 45 4f 53 20 33 35 30 44 20 44 49 47 non EOS 350D DIG 000000b0 49 54 41 4c 00 00 48 00 00 00 01 00 00 00 48 00 ITAL..H.......H. 000000c0 00 00 01 00 00 00 32 30 30 38 3a 30 36 3a 30 33 ......2008:06:03 000000d0 20 31 32 3a 34 35 3a 30 33 00 1c 00 9a 82 05 00 12:45:03....... 000000e0 01 00 00 00 12 02 00 00 9d 82 05 00 01 00 00 00 ................ 000000f0 1a 02 00 00 22 88 03 00 01 00 00 00 01 00 00 00 ...."........... offset 0 1 2 3 4 5 6 7 8 9 a b c d e f 0123456789abcdef 00000100 27 88 03 00 01 00 00 00 40 06 00 00 00 90 07 00 '.......@....... 00000110 04 00 00 00 30 32 32 31 03 90 02 00 14 00 00 00 ....0221........ 00000120 22 02 00 00 04 90 02 00 14 00 00 00 36 02 00 00 "...........6... 00000130 01 91 07 00 04 00 00 00 01 02 03 00 01 92 0a 00 ................ 00000140 01 00 00 00 4a 02 00 00 02 92 05 00 01 00 00 00 ....J........... 00000150 52 02 00 00 04 92 0a 00 01 00 00 00 5a 02 00 00 R...........Z... 00000160 07 92 03 00 01 00 00 00 05 00 00 00 09 92 03 00 ................ 00000170 01 00 00 00 49 00 00 00 0a 92 05 00 01 00 00 00 ....I........... 00000180 62 02 00 00 7c 92 07 00 8a 20 00 00 6a 02 00 00 b...|.... ..j... 00000190 86 92 07 00 00 00 00 00 00 00 00 00 00 a0 07 00 ............. .. 000001a0 04 00 00 00 30 31 30 30 01 a0 03 00 01 00 00 00 ....0100. ...... 000001b0 01 00 00 00 02 a0 03 00 01 00 00 00 80 0d 00 00 ..... .......... 000001c0 03 a0 03 00 01 00 00 00 00 09 00 00 0e a2 05 00 . ...........¢.. 000001d0 01 00 00 00 f4 22 00 00 0f a2 05 00 01 00 00 00 ....ô"...¢...... 000001e0 fc 22 00 00 10 a2 03 00 01 00 00 00 02 00 00 00 ü"...¢.......... 000001f0 01 a4 03 00 01 00 00 00 00 00 00 00 02 a4 03 00 .¤...........¤.. offset 0 1 2 3 4 5 6 7 8 9 a b c d e f 0123456789abcdef 00000200 01 00 00 00 01 00 00 00 03 a4 03 00 01 00 00 00 .........¤...... 00000210 00 00 00 00 06 a4 03 00 01 00 00 00 00 00 00 00 .....¤.......... 00000220 05 a0 04 00 01 00 00 00 04 23 00 00 00 00 00 00 . .......#...... 00000230 01 00 00 00 1e 00 00 00 28 00 00 00 0a 00 00 00 ........(....... 00000240 32 30 30 38 3a 30 36 3a 30 33 20 31 32 3a 34 35 2008:06:03 12:45 00000250 3a 30 33 00 32 30 30 38 3a 30 36 3a 30 33 20 31 :03.2008:06:03 1 00000260 32 3a 34 35 3a 30 33 00 2a e8 04 00 00 00 01 00 2:45:03.*è......
Figure 1 -- The Picture Taken In The Natural Position Of The Camera
offset 0 1 2 3 4 5 6 7 8 9 a b c d e f 0123456789abcdef 00000000 d8 ff e0 00 10 4a 46 49 46 00 01 01 01 00 48 ÿØÿà..JFIF.....H 00000010 00 48 00 00 ff e1 3e 9a 45 78 69 66 00 00 49 49 .H..ÿá>.Exif..II 00000020 2a 00 08 00 00 00 09 00 0f 01 02 00 06 00 00 00 *............... 00000030 7a 00 00 00 10 01 02 00 17 00 00 00 80 00 00 00 z............... 00000040 12 01 03 00 01 00 00 00 06 00 00 00 1a 01 05 00 ................ 00000050 01 00 00 00 98 00 00 00 1b 01 05 00 01 00 00 00 ................ 00000060 a0 00 00 00 28 01 03 00 01 00 00 00 02 00 00 00 ...(........... 00000070 32 01 02 00 14 00 00 00 a8 00 00 00 13 02 03 00 2.......¨....... 00000080 01 00 00 00 02 00 00 00 69 87 04 00 01 00 00 00 ........i....... 00000090 bc 00 00 00 22 23 00 00 43 61 6e 6f 6e 00 43 61 ¼..."#..Canon.Ca 000000a0 6e 6f 6e 20 45 4f 53 20 33 35 30 44 20 44 49 47 non EOS 350D DIG 000000b0 49 54 41 4c 00 00 48 00 00 00 01 00 00 00 48 00 ITAL..H.......H. 000000c0 00 00 01 00 00 00 32 30 30 38 3a 30 36 3a 30 33 ......2008:06:03 000000d0 20 31 32 3a 35 33 3a 34 34 00 1c 00 9a 82 05 00 12:53:44....... 000000e0 01 00 00 00 12 02 00 00 9d 82 05 00 01 00 00 00 ................ 000000f0 1a 02 00 00 22 88 03 00 01 00 00 00 01 00 00 00 ...."........... offset 0 1 2 3 4 5 6 7 8 9 a b c d e f 0123456789abcdef 00000100 27 88 03 00 01 00 00 00 90 01 00 00 00 90 07 00 '............... 00000110 04 00 00 00 30 32 32 31 03 90 02 00 14 00 00 00 ....0221........ 00000120 22 02 00 00 04 90 02 00 14 00 00 00 36 02 00 00 "...........6... 00000130 01 91 07 00 04 00 00 00 01 02 03 00 01 92 0a 00 ................ 00000140 01 00 00 00 4a 02 00 00 02 92 05 00 01 00 00 00 ....J........... 00000150 52 02 00 00 04 92 0a 00 01 00 00 00 5a 02 00 00 R...........Z... 00000160 07 92 03 00 01 00 00 00 05 00 00 00 09 92 03 00 ................ 00000170 01 00 00 00 49 00 00 00 0a 92 05 00 01 00 00 00 ....I........... 00000180 62 02 00 00 7c 92 07 00 8a 20 00 00 6a 02 00 00 b...|.... ..j... 00000190 86 92 07 00 00 00 00 00 00 00 00 00 00 a0 07 00 ............. .. 000001a0 04 00 00 00 30 31 30 30 01 a0 03 00 01 00 00 00 ....0100. ...... 000001b0 01 00 00 00 02 a0 03 00 01 00 00 00 80 0d 00 00 ..... .......... 000001c0 03 a0 03 00 01 00 00 00 00 09 00 00 0e a2 05 00 . ...........¢.. 000001d0 01 00 00 00 f4 22 00 00 0f a2 05 00 01 00 00 00 ....ô"...¢...... 000001e0 fc 22 00 00 10 a2 03 00 01 00 00 00 02 00 00 00 ü"...¢.......... 000001f0 01 a4 03 00 01 00 00 00 00 00 00 00 02 a4 03 00 .¤...........¤.. offset 0 1 2 3 4 5 6 7 8 9 a b c d e f 0123456789abcdef 00000200 01 00 00 00 01 00 00 00 03 a4 03 00 01 00 00 00 .........¤...... 00000210 00 00 00 00 06 a4 03 00 01 00 00 00 00 00 00 00 .....¤.......... 00000220 05 a0 04 00 01 00 00 00 04 23 00 00 00 00 00 00 . .......#...... 00000230 01 00 00 00 1e 00 00 00 32 00 00 00 0a 00 00 00 ........2....... 00000240 32 30 30 38 3a 30 36 3a 30 33 20 31 32 3a 35 33 2008:06:03 12:53 00000250 3a 34 34 00 32 30 30 38 3a 30 36 3a 30 33 20 31 :44.2008:06:03 1 00000260 32 3a 35 33 3a 34 34 00 2a e8 04 00 00 00 01 00 2:53:44.*è......
Figure 2 -- The Picture Taken By Rotating The Camera 90 Degrees Clock-wise
