Forcing input format for security?

[mcary]

I'd like to ensure that an attacker cannot execute arbitrary code on my server by (for example) uploading a carefully crafted Postscript with a JPEG file extension. Is there a way to take advantage of the ImageMagick feature that forces an input file format by specifying a module prefix on the filename, such as "jpg:some-file.jpg"? This is suggested as a security precaution for both ImageMagick (see "Other Security Considerations") and GraphicsMagick (see "Safe Use Of The Software", item 6).

[janko]

With MiniMagick::Image not at the moment, only if you directly use MiniMagick::Tool::Convert and friends. It looks like a useful feature to add.