https://bugzilla.wikimedia.org/show_bug.cgi?id=29999

--- Comment #2 from Brion Vibber <[email protected]> 2011-07-21 20:46:27 UTC 
---
I can work around this locally by opening and re-saving the full size image in
Gimp.

The original file has 4 color components and may be some sort of CMYK; that
might be confusing things in ImageMagick which are optimized more for RGB and
RGBA:

$ djpeg -verbose -debug Világosi_Gábor.jpg 
Independent JPEG Group's DJPEG, version 8b  16-May-2010
Copyright (C) 2010, Thomas G. Lane, Guido Vollbeding
Start of Image
Miscellaneous marker 0xe1, length 6494
Miscellaneous marker 0xed, length 15496
Miscellaneous marker 0xe1, length 6463
Adobe APP14 marker: version 100, flags 0x4000 0x0000, transform 2
Define Quantization Table 0  precision 0
           1    1    1    1    1    1    1    1
           1    1    1    1    1    1    1    1
           1    1    1    1    1    1    1    2
           1    1    1    1    1    1    2    2
           1    1    1    1    1    2    2    3
           1    1    1    1    2    2    3    3
           1    1    1    2    2    3    3    3
           1    1    2    2    3    3    3    3
Define Quantization Table 1  precision 0
           1    1    1    1    2    3    3    3
           1    1    1    2    3    3    3    3
           1    1    1    3    3    3    3    3
           1    2    3    3    3    3    3    3
           2    3    3    3    3    3    3    3
           3    3    3    3    3    3    3    3
           3    3    3    3    3    3    3    3
           3    3    3    3    3    3    3    3
Start Of Frame 0xc0: width=531, height=768, components=4
    Component 1: 1hx1v q=0
    Component 2: 1hx1v q=1
    Component 3: 1hx1v q=1
    Component 4: 1hx1v q=0
Define Restart Interval 67
Define Huffman Table 0x00
          0   0   6   2   3   1   0   0
          0   0   0   0   0   0   0   0
Define Huffman Table 0x01
          0   0   6   3   1   1   1   0
          0   0   0   0   0   0   0   0
Define Huffman Table 0x10
          0   2   1   3   4   1   3   3
          2   3   3   3   2   6   9 117
Define Huffman Table 0x11
          0   2   1   3   2   4   4   3
          5   4   4   4   6   6   5 109
Start Of Scan: 4 components
    Component 1: dc=0 ac=0
    Component 2: dc=1 ac=1
    Component 3: dc=1 ac=1
    Component 4: dc=0 ac=0
  Ss=0, Se=63, Ah=0, Al=0
PPM output must be grayscale or RGB

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