Hi Alberto,
Thanks for your update, we have analyzed your query and we are unable to confirm that you are using Xamarin.Android or Xamarin.Forms.
Could you let us know, which platform you are currently using so that we would be able to provide you the appropriate solution for your query?
Also, please share the images loaded in your application or share the image size and resolution, this will be helpful for us to give better solution in this.
Regards,
Muneesh Kumar G.