We have found one software suitable in our database for this conversion.
In most cases .img files are pictures, so eligible to be converted to any other suitable raster format, including JPEG format (.jpg, .jpeg, .jpe). It's just a matter of finding a right tool for img to jpe conversion, for example the XnView MP software.
Updated: October 4, 2016
A free (for non-commercial purposes) powerful cross-platform media browser, viewer and converter. Compatible with more than 500 formats and also supports export to 70 different file formats. It works on Windows, Linux and macOS (OS X).