What does

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[Originally posted by 00coday on 2006-01-18 20:37:13-08]

Does this mean that an image that is missing the JFIF "wrapper" can have that wrapper added via the ExifTool?  

The reason I ask is that we use an AP Preserver to store thousands (about 250,000) of images.  When the AP ingests them it removes the JFIF wrapper so that they are no longer recognizable as image files.  This makes it so that we are required to use their interface to get at the imagery in our holdings.  It is possible to get at the image files, but only Photoshop is able to open them due to the missing JFIF info.  Once the files are open in Photoshop, we can do a "Save As JPEG" and the file will be saved with the JFIF info intact, but that means batching 250,000+ images through the Photoshop process.  

It would be nice to be able to write the JFIF info to the files via a command line utility so that we are not dependent on an application that is no longer supported (AP Preserver) or one that is so expensive (Photoshop) to get at our imagery.

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[Originally posted by 00coday on 2006-01-18 20:38:34-08]

My last posting meant to read what does Added ability to write JFIF information mean?  Still not used to the formatting in this forum.

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[Originally posted by exiftool on 2006-01-18 21:08:55-08]

I know.  This forum takes a bit of getting used to...

ExifTool can now be used to edit the X/Y resolutions stored in the JFIF segment.  It won't write the JFIF segment if it didn't previously exist.

Adding the JFIF information back in would be a fairly easy thing to do, but I don't think this will solve your problem because any image editor should be able to open a standard (non-JFIF) JPEG image.  All of mine do.  So it must be more than the JFIF information that is stripped off by your AP software.