JPEG thumbnails

Simon MacMullen simon.macmullen at
Thu Jun 13 11:35:54 BST 2002

Rolf Magnus:
> On Monday 10 June 2002 17:14, Simon MacMullen wrote:
> > (2) When the thumbnail in the JPEG is wrong, you get the 
> wrong result.
> >
> > This could be a real problem. I certainly have lots of 
> photos I've rotated
> > using mogrify from ImageMagick (I think it's those, it 
> might be the ones I
> > rotated with Pixie Plus) and the thumbnail was never 
> rotated, just saved
> > back. I'm sure there are lots of other people out there in the same
> > position. I know you could say: "your JPEGs are broken, fix 
> them", but I
> > have no idea how and I'm sure the normal users don't either.
> Hmm, didn't think about that. Actually, you might want to 
> file a bug report to 
> the ImageMagick people that they rotate the image but keep 
> the thumbnail 
> without rotating it. This is clearly a bug in the image 
> manipulation program. 
> It should either recreate the thumbnail or, if it can't do 
> this, at least 
> remove it if it's not valid any more.

Well, I've been and pestered the ImageMagick people, and they have
essentially told me that "that's just the way it works". There is a command
line option you can use to strip all EXIF data, but not one to just clear
the thumbnail.


I therefore propose that someone add a checkbox to "ignore thumbnails in
images" with a what's this help saying "to work around broken programs like

Unless I hear otherwise, I will assume that the someone will have to be me.

Carsten, what are the odds on being able to ship a jpeg thumbnail
reconstructor? It would be really handy...

Cheers, Simon

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