Not so much "tiny" (it's at full resolution, IIRC), but highly compressed.
I can't remember now if that's in the "private data" tag.  But even if the
preview image *is* in the file, if it isn't in same position relative to
the actual image that could be enough to make the camera unhappy; I rather
doubt that the firmware slavishly follows image tags to get to data offsets
that are going to point to data in a "known" place.

On Fri, May 20, 2011 at 10:20:13AM -0500, Bob Sullivan wrote:
> Doesn't the camera prepare a tiny little picture for the back display
> at the same time it writes the jpeg?
> I don't think your computer would do the same.
> Is John Francis our file layout maven?  He may know.
> Regards,  Bob S.
> 
> On Fri, May 20, 2011 at 8:17 AM, John Sessoms <jsessoms...@nc.rr.com> wrote:
> > From: steve harley
> >>
> >> On 2011-05-19 07:52 , John Sessoms wrote:
> >>>
> >>> > One drawback of that is the camera will probably not display the images
> >>> > written to the card by the computer. During my internship, I tried
> >>> > something similar with the K10D. I had no thumb drive with me when I
> >>> > needed to transfer a JPEG from my laptop to another computer. Both have
> >>> > built in card readers.
> >>
> >> it works fine if you mirror the folder structure exactly
> >
> > I'm not so sure. The JPEG was copied into the existing folder that the
> > camera had created on the card. The camera just showed "Cannot Display
> > Image" on the LCD when it got to that JPEG.
> >
> >
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