How  to tell Vim to re-evaluate the modeline of a file if it's already
  loaded? Simple as that:

                                   :e %

  Just re-open the file. Well, yes.


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  How to resize images to a given size using ImageMagick while  cropping
  exceeding parts? Simple as that:

        convert foo.jpg -resize 1024x600^ -extent 1024x600 bar.jpg