Thumbnail not created for EXIF jpeg file by using Imagemagick
Solution :
The problem due the Imagemagick version. You need to upgrade your Imagemagick version. You can easily upgrade your Imagemagick version by using yum command.
root# yum install glib2
root# yum install libpng
root# yum install libjpeg
root# yum install libtiff
root# yum install ghostscript
root# yum install freetype
root# yum install ImageMagick
root# yum install ImageMagick-perl