How to convert from img to iso file format

Today I needed to convert a file from .img file format to .iso file format.

The following are the steps to do so:

• create a directory.
  

  mkdir ~/mydir.d

  
  
• mount .img file into the created directory. You must perform this task as root.
  

  sudo mount -o loop myimage.img mydir.d

  
  
• In order to generate the iso, issue the command:
  

  genisoimage -o myimage.iso mydir.d/

That is all. Now you have your file in iso file format (myimage.iso).