How to scan with Canon integrated scanner when I have the 'scangearmp' drivers?

I have created this question in order to provide an answer. The idea is that having this question on a **Pixma** printer I have found that many people that have the proper drivers (different depending on the model of printer-scanner, but called 'scangearmp') for such an integrated scanner are trying to **use it with Simple Scan or Xsane without success**. How to use a such scanner?