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faststone lossless rotation bug?

 
 
james
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      10-21-2009
Anyone used a photo viewer called faststone viewer?

If I rotate a jpg image with it (supposedly it performs a lossless
rotation), it displays fine in faststone, but the icon view in windows
explorer still displays it incorrectly. Same problem when the photo is
transferred to an ipod touch.

Is this a bug in faststone or in vista and ipod?

 
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Paul Furman
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      10-21-2009
james wrote:
> Anyone used a photo viewer called faststone viewer?
>
> If I rotate a jpg image with it (supposedly it performs a lossless
> rotation), it displays fine in faststone, but the icon view in windows
> explorer still displays it incorrectly. Same problem when the photo is
> transferred to an ipod touch.
>
> Is this a bug in faststone or in vista and ipod?


Sounds like faststone didn't get around to updating the embedded
preview/thumbnail. Here's a geeky solution with some explanation:
http://www.christian-etter.de/?p=297

I've had good results with irfanview except where programs read the
rotation data in the exif from the camera, but I don't think that's your
issue. Another possibility is some programs create their own cache like
windows ini files but also not likely in your case since the ipod is
seeing it too.

--
Paul Furman
www.edgehill.net
www.baynatives.com

all google groups messages filtered due to spam
 
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Ofnuts
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      10-21-2009
james wrote:
> Anyone used a photo viewer called faststone viewer?
>
> If I rotate a jpg image with it (supposedly it performs a lossless
> rotation), it displays fine in faststone, but the icon view in windows
> explorer still displays it incorrectly. Same problem when the photo is
> transferred to an ipod touch.
>
> Is this a bug in faststone or in vista and ipod?


The metadata in a JPEG file can include an "orientation" flag. In
digital cameras, the longest dimension of the JPEG image always
corresponds to the bottom of the camera, and portrait pictures are
indicated by a different orientation (two possible values here,
depending on which side the camera has been tilted)(this assumes the
camera has a built-in sensor).

A "clever" way to perform a lossless rotation of the JPEG file is to
only update this flag, so the rotation will actually be performed by the
displaying application. There are however some applications that ignore
this flag: most notably the "Windows Picture and Fax viewer" (at least
the WinXP one, can't tell if Vista or Seven have fixed it), and likely
the ones in mobile phones (because it makes sense to display the longest
side of the picture along the longest side of the (tiny) screen since
the screen is very easy to rotate).


--
Bertrand
 
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Martin Brown
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      10-21-2009
james wrote:
> Anyone used a photo viewer called faststone viewer?
>
> If I rotate a jpg image with it (supposedly it performs a lossless
> rotation), it displays fine in faststone, but the icon view in windows
> explorer still displays it incorrectly. Same problem when the photo is
> transferred to an ipod touch.


The program hasn't rotated the embedded icon thumbnail in the image
header. It need not do this losslessly since the thumbnail can be
recreated form the main dataset. I'd say bug.
>
> Is this a bug in faststone or in vista and ipod?
>


Program fault - inconsistent header data in final image. Removing the
thumbnail would be preferable to leaving in a misleading one (then the
image browser would make its own from the main image data).

Regards,
Martin Brown
 
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