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JPEG Lossless: Auto-rotate (EXIF) does not adhere to "Perfect" transformation

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    Pending JPEG Lossless: Auto-rotate (EXIF) does not adhere to "Perfect" transformation

    IrfanView v4.72 x64
    Jpg_transform.dll v4.71 (from v4.72 archive)

    Test images: JPEG from phone camera, dimensions 2944 x 1656, or dimensions 4032 x 2268.

    I just found out that the combination of enabling Auto-rotate (according to EXIF orientation, if available) + "Perfect" transformation only (don't cut OFF rows/columns in this case) does not show the expected behavior: instead of warning that a perfect rotation isn't possible ("Bad image dimensions"), it just acts like the Perfect transformation isn't selected and does a lossy rotation that cuts off a strip of 8 pixels.

    In contrast, 90 and 180 degrees of the manual rotation options, plus vertical flip, do show this warning message.
    Last edited by TFGYG786; 07.06.2025, 10:58 AM.

    #2

    The developer of IrfanView does not read this forum. If you found a bug or have a feature request you need to write him an email.
    See Help > About for his mail adress.?
    Win 10/64 Home 22H2 (19045.5737) IrfanView 4.72/64
    Hate has caused a lot of problems in this world, but it has not solved one yet. (Maya Angelou)

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      #3
      Then why isn't this forum closed?

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        #4
        Originally posted by TFGYG786 View Post
        Then why isn't this forum closed?
        To save Irfan Skiljan dealing with duplicate reports, or badly formulated reports.
        Often, other users can say if a bug report has been submitted already, or that the reported issue is not a bug at all.
        Before you post Edit your profile • IrfanView 4.72 • Windows 10 Home 19045.2486

        Irfan PaintIrfan View HelpIrfanPaint HelpMore SkinsFastStone CaptureUploads

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          #5
          All right, might be more clear to add a disclaimer/explanation as to what this forum can be used for then.

          Anyway, Irfan has just fixed this issue and sent me a working new version of the plugin. So it'll probably be available for everyone in the next update.

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            #6
            Thanks for the update. I modified the thread’s status. Did you read the Bug Reports sticky thread?
            Before you post Edit your profile • IrfanView 4.72 • Windows 10 Home 19045.2486

            Irfan PaintIrfan View HelpIrfanPaint HelpMore SkinsFastStone CaptureUploads

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