faststone lossless rotation bug?

Discussion in 'Digital Photography' started by james, Oct 21, 2009.

  1. james

    james Guest

    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?
     
    james, Oct 21, 2009
    #1
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  2. james

    Paul Furman Guest

    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
     
    Paul Furman, Oct 21, 2009
    #2
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  3. james

    Ofnuts Guest

    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
     
    Ofnuts, Oct 21, 2009
    #3
  4. james

    Martin Brown Guest

    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
     
    Martin Brown, Oct 21, 2009
    #4
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