This problem does indeed exist, although I have never encountered it. Probably because I always optimize and minimize the images I include in the EPUB file, so removing the EXIF data is somehow mandatory.
However, since the problem exists I have tried to find a solution for those who need it.
The plugin detects if any of the JPG images do not have an 'Orientation' tag with a value other than 1 and displays a corresponding report in the 'Validation Results' window.
Hint 1:
The
JPEGOptimizer plugin prepared by Doitsu takes the orientation information into account.
Hint 2:
The
jpegoptim program used by the JPEGOptimizer plugin has the ability to remove EXIF.
In the attachments:
- a screenshot from ADE 4.5
- a sample EPUB file
- a view of the Sigil window after launching the plugin
- the CheckImageOrientation plugin