[Boost-users] [GIL] rotated90cw_view - jpeg lossless rotation

I rotate jpeg photos to portrait by reading the file and saving it like this: boost::gil::jpeg_write_view(file, boost::gil::rotated90cw_view(boost::gil::view(img))); results: original size: 4106172 image/jpeg 3264 2448 rotated size: 5594681 image/jpeg 2448 3264 The rotation should be lossless (as the image is a multiple of the jpeg MCU) but the size has increased significantly and the exif tags disappeared. My questions: Has it been tested that the rotation is lossless ? What can I do make sure the exif tags are preserved ? thanks jose