Why does lossless jpg rotation make a larger file?

Discussion in 'Digital Photography' started by louise, Jan 28, 2004.

  1. louise

    louise Guest

    Thanks for all your responses to my questions about
    rotation.

    I have now tried rotating an image in Irfanview and in
    Adobe PhotoImpressions. I have chosen lossless rotation in
    Irfanview and rotation - best quality, in PhotoImpressions.

    In both cases the resulting file is larger - about 500+ kb
    larger - with the same final size and number of megapixels.

    I think I don't understand the concepts involved and so I
    don't understand why the image doesn't stay exactly the
    same size.

    If data is actually added, does this really improve the
    image I would eventually print or have printed, does it
    make no difference in the image, or what is happening?

    Thanks again.
    Louise ()
     
    louise, Jan 28, 2004
    #1
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  2. louise

    Ed Wurster Guest

    "louise" wrote ...
    > I have now tried rotating an image in Irfanview and in
    > Adobe PhotoImpressions. I have chosen lossless rotation in
    > Irfanview and rotation - best quality, in PhotoImpressions.
    >
    > In both cases the resulting file is larger - about 500+ kb
    > larger - with the same final size and number of megapixels.


    If you know the original JPG quality setting, then choose lossless rotation,
    and save with the same quality setting, the file size is the same.

    I confirmed this with Irfanview.

    Ed
     
    Ed Wurster, Jan 29, 2004
    #2
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