Hi Luc

You've stumbled across a peculiarity of JPEG images: the format allows for
a simplified way to rotate an image through 90 degrees just by setting a
flag that says "rotate me before viewing". The feature is designed to make
it easier for digital cameras to rotate images correctly. However, many
JPEG viewers in practice ignore the flag. So, if you have any such images
you need to convert them to properly rotate the image.

There's a lot more detail here if you're interested:

http://keyj.emphy.de/exif-orientation-rant/

Best wishes

Jeremy.



On Thu, Jul 16, 2015 at 10:05 PM, Luc@TW <[email protected]> wrote:

> OK, I noticed now that these pictures that are displayed in portrait in my
> Mac, were displayed in landscape orientation in my PC (what else would you
> expect ;-)
> So I rotated them 90° in my PC (which apparently didn't have any effect
> yet) and then I rotated them 4x 90° in my Mac, and now they are displayed
> OK in my TiddlyWiki!
> So this problem is also 'solved' :-)
>
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-- 
Jeremy Ruston
mailto:[email protected]

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