Preview generator rotating the image by 90 degrees clockwise while generating thumbnail

[AbhijitKulkarni95]

Preview generator rotating the image by 90 degrees clockwise while generating thumbnail

Original image:

Generated thumbnail:

Please let me know if I have to change something.

Thanks in advance.

[inkhey]

Hello, Thanks for using preview_generator.
The issue is related to exif rotation metadata. In fact the original image is in landscape but contain some exif rotation metadata, this way your browser is able to display your image in portrait mode.

In current state preview_generator doesn't look at theses metadata, so the rendered preview image:

• doesn't contain exif rotation metadata
• is not either hardly rotated to follow theses infos.

So the rendered image by preview_generator is not rotated the way, you expect.

There is already a pending issue about this:
#166
the proper way to solve this seems to replace exif rotation metadata in generated preview (to have same behavior).

[AbhijitKulkarni95]

Hi, Thanks for the reply.

By adding image = ImageOps.exif_transpose(image) in image__Pillow.py I was able to resolve this issue.

Any idea if this is the right way?

[lebouquetin]

the proper way to solve this seems to replace exif rotation metadata in generated preview (to have same behavior).

@inkhey way you write "replace exif rotation metadata", you mean "copy rotation metadata from original image to thumbnail one"? If so, it looks like this the right way for me too.

[tonypottera24]

Any ideas of how to fix this when wand is used?

[AbhijitKulkarni95]

Any ideas of how to fix this when wand is used?

No idea buddy.

[tonypottera24]

I followed your suggestions and add these code before I send files into PreviewManager

    try:
        with PILImage.open(image_path) as image:
            image = PILImageOps.exif_transpose(image)
        image.save(image_path)
    except Exception as e:
        print('not a image')
        print(e)

[AbhijitKulkarni95]

I followed your suggestions and add these code before I send files into PreviewManager

    try:
        with PILImage.open(image_path) as image:
            image = PILImageOps.exif_transpose(image)
        image.save(image_path)
    except Exception as e:
        print('not a image')
        print(e)

You can upgrade Pillow. It is fixed in the latest version.
pip install Pillow==8.3.1

[inkhey]

Image rotation has been introduced by #274
About the fact we should probably keep exif instead of rotating image itself, there is a ticket here : #166