<https://secure.gravatar.com/avatar/c3512c9d6042cf52273542ff1edfa121?s=96&amp;d=mm&amp;r=g>
<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>
<https://annphoto.net/photoshop/usando-curvas-no-adobe-photoshop/>