ImageMagick supports a majority of image formats natively, however, some formats such as JPEG require delegate libraries. Do you have the JPEG and JPEG Development RPMS installed on your system? If not, download and install then rebuild / reinstall ImageMagick. To verify, type
We get this line:
- JPEG* JPEG rw- Joint Photographic Experts Group JFIF format (62)
The rw- mode indicates the JPEG format is readable / writeable with the assistance of libJPEG version 62.