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Jpeg not a jpeg?

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    Jpeg not a jpeg?

    I've got an app which "listens" to a directory on my pc and when a jpeg arrives it fires up a sub app.

    Now this works with a jpeg from a windows 7 machine, but not with one created on an xp laptop, anyone have any clues?

    Here is one which doesn't get detected

    https://www.dropbox.com/s/3x6m5zhone...ture_00046.zip

    (I've zipped it otherwise it would just open in a browser)

    Thanks

    #2
    Originally posted by Archangel View Post
    I've got an app which "listens" to a directory on my pc and when a jpeg arrives it fires up a sub app.

    Now this works with a jpeg from a windows 7 machine, but not with one created on an xp laptop, anyone have any clues?

    Here is one which doesn't get detected

    https://www.dropbox.com/s/3x6m5zhone...ture_00046.zip

    (I've zipped it otherwise it would just open in a browser)

    Thanks
    Checking the obvious

    How's the app configured? Are file extensions case sensitive?

    Comment


      #3
      Originally posted by mudskipper View Post
      Checking the obvious

      How's the app configured? Are file extensions case sensitive?
      The app was purchased, I've tried Jpeg, JPEG and Jpg with no result. (I've also sent the developer the file but he hasn't got back to me yet, so I thought I'd ask the assembled brains of cuk)

      Comment


        #4
        Well it's a valid jpeg file, if that's what you wanted to know.

        Why don't you try opening it on your Win7 machine, doing a "Save As" to overwrite it with itself, same filename, and see if it then works?

        Anything that "listens" in a directory is likely waiting for filenames to arrive and is unlikely to be sensitive to what's in it. For example, take a text file, rename it to .JPG and see if that works.

        I did notice that the filename is not 8+3 so could that be something to do with it?

        Comment


          #5
          Originally posted by Platypus View Post
          Anything that "listens" in a directory is likely waiting for filenames to arrive and is unlikely to be sensitive to what's in it. For example, take a text file, rename it to .JPG and see if that works.
          There's a whole bunch of stuff in a JPEG file which the app may be looking for.

          Here's the output from exiftool

          Code:
          ExifTool Version Number         : 9.17
          File Name                       : Capture_00046.JPG
          Directory                       : .
          File Size                       : 37 kB
          File Modification Date/Time     : 2013:02:07 11:55:46+01:00
          File Access Date/Time           : 2013:02:17 20:38:53+01:00
          File Inode Change Date/Time     : 2013:02:17 20:37:51+01:00
          File Permissions                : rwxr-xr-x
          File Type                       : JPEG
          MIME Type                       : image/jpeg
          Exif Byte Order                 : Little-endian (Intel, II)
          Make                            : Canon
          Camera Model Name               : Canon PowerShot G5
          Orientation                     : Horizontal (normal)
          X Resolution                    : 180
          Y Resolution                    : 180
          Resolution Unit                 : inches
          Modify Date                     : 2013:02:07 13:56:27
          Y Cb Cr Positioning             : Centered
          Exposure Time                   : 1/50
          F Number                        : 4.0
          Exif Version                    : 0220
          Date/Time Original              : 2013:02:07 13:56:27
          Create Date                     : 2013:02:07 13:56:27
          Components Configuration        : Y, Cb, Cr, -
          Compressed Bits Per Pixel       : 2
          Shutter Speed Value             : 1/50
          Aperture Value                  : 4.0
          Max Aperture Value              : 2.5
          Flash                           : Off, Did not fire
          Focal Length                    : 14.4 mm
          Macro Mode                      : Normal
          Self Timer                      : Off
          Quality                         : Normal
          Canon Flash Mode                : Off
          Continuous Drive                : Single
          Focus Mode                      : Single
          Record Mode                     : JPEG
          Canon Image Size                : Small
          Easy Mode                       : Manual
          Digital Zoom                    : None
          Contrast                        : Normal
          Saturation                      : Normal
          Sharpness                       : 0
          Camera ISO                      : 50
          Metering Mode                   : Evaluative
          Focus Range                     : Auto
          AF Point                        : Manual AF point selection
          Canon Exposure Mode             : Program AE
          Lens Type                       : Unknown (-1)
          Max Focal Length                : 28.8125 mm
          Min Focal Length                : 7.1875 mm
          Focal Units                     : 32/mm
          Max Aperture                    : 2.5
          Min Aperture                    : 8
          Flash Activity                  : 0
          Flash Bits                      : (none)
          Focus Continuous                : Single
          AE Setting                      : Normal AE
          Zoom Source Width               : 2592
          Zoom Target Width               : 2592
          Spot Metering Mode              : Center
          Photo Effect                    : Off
          Manual Flash Output             : n/a
          Focal Type                      : Zoom
          Focal Plane X Size              : 7.37 mm
          Focal Plane Y Size              : 5.51 mm
          Auto ISO                        : 100
          Base ISO                        : 50
          Measured EV                     : 10.75
          Target Aperture                 : 4
          Target Exposure Time            : 1/50
          Exposure Compensation           : 0
          White Balance                   : Auto
          Slow Shutter                    : Off
          Shot Number In Continuous Burst : 0
          Optical Zoom Code               : 6
          Flash Guide Number              : 0
          Flash Exposure Compensation     : 0
          Auto Exposure Bracketing        : Off
          AEB Bracket Value               : 0
          Control Mode                    : Computer Remote Control
          Focus Distance Upper            : 2.04 m
          Focus Distance Lower            : 0 m
          Bulb Duration                   : 0
          Camera Type                     : Compact
          Auto Rotate                     : None
          ND Filter                       : Off
          Self Timer 2                    : 0
          Flash Output                    : 0
          Num AF Points                   : 9
          Valid AF Points                 : 1
          Canon Image Width               : 640
          Canon Image Height              : 480
          AF Image Width                  : 2592
          AF Image Height                 : 215
          AF Area Width                   : 467
          AF Area Height                  : 39
          AF Area X Positions             : 0 0 0 0 0 0 0 0 0
          AF Area Y Positions             : 0 0 0 0 0 0 0 0 0
          AF Points In Focus              : 0
          Primary AF Point                : 0
          Thumbnail Image Valid Area      : 0 0 0 0
          Canon Image Type                : IMG:PowerShot G5 JPEG
          Canon Firmware Version          : Firmware Version 2.00
          File Number                     : 141-4188
          Owner Name                      : 
          Canon Model ID                  : PowerShot G5
          User Comment                    : 
          Flashpix Version                : 0100
          Color Space                     : sRGB
          Exif Image Width                : 640
          Exif Image Height               : 480
          Interoperability Index          : R98 - DCF basic file (sRGB)
          Interoperability Version        : 0100
          Related Image Width             : 640
          Related Image Height            : 480
          Focal Plane X Resolution        : 2261.484099
          Focal Plane Y Resolution        : 2264.150943
          Focal Plane Resolution Unit     : inches
          Sensing Method                  : One-chip color area
          File Source                     : Digital Camera
          Custom Rendered                 : Normal
          Exposure Mode                   : Auto
          Digital Zoom Ratio              : 1
          Scene Capture Type              : Standard
          Compression                     : JPEG (old-style)
          Thumbnail Offset                : 2048
          Thumbnail Length                : 3264
          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)
          Aperture                        : 4.0
          Drive Mode                      : Single-frame Shooting
          ISO                             : 50
          Image Size                      : 640x480
          Lens                            : 7.2 - 28.8 mm
          Lens ID                         : Unknown 7-28mm
          Scale Factor To 35 mm Equivalent: 4.8
          Shooting Mode                   : Program AE
          Shutter Speed                   : 1/50
          Thumbnail Image                 : (Binary data 3264 bytes, use -b option to extract)
          Circle Of Confusion             : 0.006 mm
          Field Of View                   : 29.1 deg
          Focal Length                    : 14.4 mm (35 mm equivalent: 69.4 mm)
          Hyperfocal Distance             : 8.32 m
          Lens                            : 7.2 - 28.8 mm (35 mm equivalent: 34.6 - 138.8 mm)
          Light Value                     : 10.6
          Hmm. I see the executable bits are set on the file permissions. I wonder if that's throwing a spanner into the works.
          Last edited by Sysman; 17 February 2013, 19:49.
          Behold the warranty -- the bold print giveth and the fine print taketh away.

          Comment


            #6
            Thanks sysman, I'll grab the data from a file that is detected and compare them.

            Comment

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