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Thread: Wrong image rotation for many panoramas

  1. #1

    Default Wrong image rotation for many panoramas

    I have the issue that Irfanview shows a wrong image rotation for many panoramas created by my cell phone.
    With having the option "Auto-rotate image according to EXIF info" deactivated, many of the panoramas are shown upside down (in the thumbnail viewer as well as in the image viewer). Opening the same image with other tools (e.g. paint.net, Windows photo viewer, etc.) shows the image with the correct rotation.
    Screenshot of behavior attached (Irfanview compared to paint.net). Second screenshot show that the image cannot be rotated manually (other images from the cell phone can be rotated without issues, only panaromas don't work).

    Operating System: Windows 10 Version 1903 Build 18362.356
    Cell phone: Samsung Galaxy S7
    Same behavior with Irfanview 32bit/64bit
    Image can be found in the following ZIP-file: https://workupload.com/file/tysS6X9N (File has a size of >6MB - upload only allowed for small images).
    Recipe: Open the image with Irfanview with the option "Auto-rotate image according to EXIF info" deactivated => shown upside down. Open image with another editor => shown with correct rotation.

    Thank you in advance.
    Attached Thumbnails Attached Thumbnails Click image for larger version. 

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    Last edited by Arie17; 06.10.2019 at 10:54 PM.

  2. #2
    Moderator Enterprise User Bhikkhu Pesala's Avatar
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    Default

    If you want the image to be rotated according to the Exif data, clearly you must enable that option. Other editors probably do not offer users the option, but just rotate it automatically.

    Obviously, this is not a bug.

  3. #3

    Default

    Maybe my first description was unclear.
    Recipe:
    1) Open the image with a program e.g. paint.net or the Windows photo viewer. You will see that the image itself has a correct orientation.
    2) Open the image in Irfanview. You will see that the image is shown upside down (with the option "Auto-rotate image according to EXIF info" disabled).
    => Why does Irfanview rotate the image when it already has the correct rotation?

    Thank you in advance.

  4. #4
    Moderator Enterprise User Bhikkhu Pesala's Avatar
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    The Exif orientation is Bottom Right, if you enable the autorotation according to Exif data, the bridge is the right way up when opened.

    The error message on trying to do a lossless rotation is another issue. That seems to be an issue with large files, which the plugin cannot handle.

  5. #5
    Multiple User Jacal's Avatar
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    Here are the ExifTool data:

    Code:
    ---- IFD0 ----
    Image Width                     : 6496
    Image Height                    : 2048
    Make                            : samsung
    Camera Model Name               : SM-G930F
    Orientation                     : Rotate 180
    The GIMP - by default, I believe - asks what to do:

    Click image for larger version. 

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    So, as Bhikkhu Pesala has already said, this is the correct and expected behaviour.
    IrfanView 4.53 (64-bit as the default image viewer, 32-bit for comparison)
    PC: Windows 10, i5 CPU, 16 GB RAM, GPU 4 GB RAM
    Laptop: Windows 10, i3 CPU, 8 GB RAM, no dedicated GPU

  6. #6

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    Sorry my fault...
    Thanks for the quick replies!

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