I placed an image into a Publisher document page and added text within the image area. After grouping all of the elements, with the group selected I exported to JPEG ("Selection with background"). The resulting JPEG file contained a thin white border that was not in the original file. Then I tried exporting using the "without background" setting. Same result. Then I tried it as a PNG ("selection with background"). Same result. Next I tried it as a PNG without background and finally the thing was exported without the thin white rule.
This has happened several times when I've exported a selection to JPEG. (The quality setting is always 85 or higher.) So it doesn't appear to be some peculiarity of a particular image.
I don't want to have to export first to PNG, then open the PNG file in some other program and re-save as JPEG. Is there some way to save from Publisher to JPEG without the unwanted rule around the image?