I'm using the following function as the callable in render_variations keyword argument of StdImageField. Maybe this can be useful for this issue.

from django.core.files.base import ContentFile

from stdimage.utils import render_variations

def resize_and_autorotate(file_name, variations, storage):
    with storage.open(file_name) as f:
        with Image.open(f) as image:
            file_format = image.format
            exif = image._getexif()

            # if image has exif data about orientation, let's rotate it
            orientation_key = 274 # cf ExifTags
            if exif and orientation_key in exif:
                orientation = exif[orientation_key]

                rotate_values = {
                    3: Image.ROTATE_180,
                    6: Image.ROTATE_270,
                    8: Image.ROTATE_90
                }

                if orientation in rotate_values:
                    image = image.transpose(rotate_values[orientation])

            with BytesIO() as file_buffer:
                image.save(file_buffer, file_format)
                f = ContentFile(file_buffer.getvalue())
                storage.delete(file_name)
                storage.save(file_name, f)

    # render stdimage variations
    render_variations(file_name, variations, replace=True, storage=storage)

    return False  # prevent default rendering

Uh oh!

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