thumbor/thumbor 6.3.0 on GitHub

Features

New background_color filter (thanks @hermanmaritz – #875)
Enable xheaders for Tornado, allowing discovery of the true client IP at the Thumbor level when behind a proxy (thanks @gi11es – #847)
Allow specifying validate_cert to Tornado via the new HTTP_LOADER_VALIDATE_CERTS config variable (default is None) (thanks @kkopachev – #751)
Allow specifying PNG compression level by means of the PNG_COMPRESSION_LEVEL config variable (default is 6) (thanks @dkhabarov – #825)

Fix reorientation when no Exif information is available (thanks @seffenberg-naspers – #849)
Fix a quality loss issue by removing the draft option so PNGs get colorspace converted before resizing operations (thanks @okor – #858)
Convert 1bit PNGs before resizing (thanks @kevin1024 – #859)
Make Transformer.smart_detect() a coroutine and fix issues with S3 storage (thanks @mpilar and @decebal – #859, #721 and #722)
Improve SVG detection and conversion
Improve the distributed_collage filter
Fix unhandled 'NoneType' object has no attribute 'mode' detector exceptions (thanks @mvdklip – #841)
Return 400 - Bad Request on watermark errors (thanks @noamsml and @nerdrew – #854)
Convert indexed color images back to their original mode after resizing (thanks @okor – #873)
Do not hang request on Engine.read() exceptions (thanks @savar – #871)
Do not hang request on Storage.get() exceptions