While that may have been true in 2014, today it's hard to find an exploitable bug affecting a major image format parser in ImageMagick. Assuming you aren't using unsanitized user-provided parameters on the command line with it, it should be fine unless your attacker is very motivated.
ImageTragick did not affect major image formats; it was a vulnerability in the parser for ImageMagick's scripting languages [1]. The real problem was that support for scripting was enabled by default, and there was no obvious big red button to disable it.
