Image::Magick can read from perl filehandles though: 
  $image = Image::Magick->new;
  open(IMAGE, 'image.gif');
  $image->Read(file=>\*IMAGE);
  close(IMAGE);

[download]
despite that, IO::Scalar wouldn't work?

In reply to Re^3: reading image blob w/Image::Magick by davidrw
in thread reading image blob w/Image::Magick by yoz-y

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