I discovered that some clients' images were mysteriously rotating 90 or 270 degrees after uploading them to their website. The file would display correctly in Photoshop, but would be rotated incorrectly once uploaded.
To add to the weirdness, if you re-downloaded the image and opened it in Photoshop -- it looked correct!
To be honest, I'm not sure what exactly causes this. There's a piece of EXIF data, "Image Orientation" that somehow gets set, and somehow causes PIL to show the image incorrectly (or perhaps correctly, depending on your view).
This patch simply looks at the EXIF data and re-rotates it to undo the "Image Orientation" tag. It doesn't modify the EXIF data. In fact, some quick tests reveal most EXIF data will be lost once running the script (which is not a concern of mine at the moment).
pip install img_rotate
The simplest way to use this script is from the command line, passing in the filename of the image to fix:
>>> python img_rotate.py messed_up.jpg messed_up.jpg was rotated -90 degrees.
Using in your own scripts
The script basically consists of a single function,
img: can be an Image instance or a path to an image file.
save_over: indicates if the original image file should be replaced by the new image (only possible when
imgis a file path).
fix_orientation returns a tuple in the format
imgwill be the corrected Image instance.
degrees_rotatedis the number of degrees rotated(!). Positive values indicate clockwise, negative indicates counter-clockwise.
0is returned if no rotation took place.
Questions or Bugs? Send me a message via github.
The MIT License
Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:
The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.