I found an issue with Polish’s WebP implementation. It does not honor an image’s “orientation” meta data when recompressing.
EXAMPLES
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The jpg converted to webp by cloudflare’s Polish. The image is sideways as originally taken on the phone. The orientation value of
6 (Rotated 90° CCW)was not taken into consideration when compressing.
https://abovebeyondgaragedoors.com/media/rte/garage-doors/20171218_124101.jpg -
The original jpg compressed by Polish but not converted to webp. The orientation value of
6 (Rotated 90° CCW)is maintained when optimizing/re-rendering.
https://abovebeyondgaragedoors.com/media/rte/garage-doors/20171218_124101.jpg?abc
Of course a good web designer will export the image re-rendered with proper rotation and no meta data. But clients have access to a CMS and will usually not be so savvy when uploading.