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

Subject: [Boost-users] [GIL] rotated90cw_view - jpeg lossless rotation
From: Jose (jmalv04_at_[hidden])
Date: 2009-12-06 05:10:32

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