Re: jpeg file weirdness

26 Mar 2012

      On 26 March 2012 19:53, Graeme Cross <gcross@fastmail.fm> wrote:
...
Run "jpeginfo -c" on the JPEG file and see if it reports any errors. I
have found it to work well on a range of malformed JPEG images.
Looks fine to me:

brian@sys05b:~/Downloads$ jpeginfo  -c frank_003.jpg
frank_003.jpg 9752 x 9676 24bit JFIF  N 5946895  [OK]

brian@sys05b:~/Downloads$ identify --verbose frank_003.jpg
frank_003.jpg JPEG 9752x9676 9752x9676+0+0 8-bit DirectClass 5.947MB
0.000u 0:00.000
identify: unable to open image `--verbose':  @ error/blob.c/OpenBlob/2489.

brian@sys05b:~/Downloads$ identify -verbose frank_003.jpg
Image: frank_003.jpg
  Format: JPEG (Joint Photographic Experts Group JFIF format)
  Class: DirectClass
  Geometry: 9752x9676+0+0
  Resolution: 4800x4800
  Print size: 2.03167x2.01583
  Units: PixelsPerInch
  Type: TrueColor
  Endianess: Undefined
  Colorspace: RGB
  Depth: 8-bit
  Channel depth:
    red: 8-bit
    green: 8-bit
    blue: 8-bit
  Channel statistics:
    Red:
      min: 6 (0.0235294)
      max: 255 (1)
      mean: 53.8332 (0.211111)
      standard deviation: 51.604 (0.202369)
      kurtosis: 4.55959
      skewness: 2.18813
    Green:
      min: 9 (0.0352941)
      max: 255 (1)
      mean: 54.671 (0.214396)
      standard deviation: 51.3301 (0.201294)
      kurtosis: 4.59683
      skewness: 2.19549
    Blue:
      min: 9 (0.0352941)
      max: 255 (1)
      mean: 56.3935 (0.221151)
      standard deviation: 51.058 (0.200228)
      kurtosis: 4.57194
      skewness: 2.19332
  Image statistics:
    Overall:
      min: 6 (0.0235294)
      max: 255 (1)
      mean: 41.2244 (0.161664)
      standard deviation: 50.4332 (0.197777)
      kurtosis: 5.44944
      skewness: 2.24724
  Rendering intent: Undefined
  Interlace: None
  Background color: white
  Border color: rgb(223,223,223)
  Matte color: grey74
  Transparent color: black
  Compose: Over
  Page geometry: 9752x9676+0+0
  Dispose: Undefined
  Iterations: 0
  Compression: JPEG
  Quality: 84
  Orientation: Undefined
  Properties:
    date:create: 2012-03-27T09:28:00+11:00
    date:modify: 2012-03-27T09:27:54+11:00
    jpeg:colorspace: 2
    jpeg:sampling-factor: 2x2,1x1,1x1
    signature: 18ba93cddf88717f67bd8157d17a27c2df75b60ff6d055d05c810a60d0a488e9
  Artifacts:
    verbose: true
  Tainted: False
  Filesize: 5.947MB
  Number pixels: 94.36MB
  Pixels per second: 47.66MB
  User time: 1.980u
  Elapsed time: 0:02.979
  Version: ImageMagick 6.6.0-4 2011-06-15 Q16 http://www.imagemagick.org

-- 
Brian May <brian@microcomaustralia.com.au>