title: Remove/update add_image_size in Wordpress Parent theme functions.php file
body: <p>I'm creating a child theme from a parent theme in Wordpress. I would like to change the defined image sizes in the parent's functions.php file: </p>
  
  <pre><code>/* Image sizes */
  add_action( 'init', 'oxygen_image_sizes' );   
  
  /**Image sizes**/
  function oxygen_image_sizes() {  
  add_image_size( 'archive-thumbnail', 470, 140, true );
  add_image_size( 'single-thumbnail', 470, 260, true );
  add_image_size( 'featured-thumbnail', 750, 380, true );
  add_image_size( 'slider-nav-thumbnail', 110, 70, true );
  }    
  </code></pre>
  
  <p>Here is a link that I found that seems pretty straightforward but it's not working for me.
  <a href="https://wordpress.stackexchange.com/questions/74934/remove-or-update-add-image-size">https://wordpress.stackexchange.com/questions/74934/remove-or-update-add-image-size</a> </p>
  
  <p>Here is the code that I'm using in my child theme's functions.php file:  </p>
  
  <pre><code>function child_theme_setup() {
  add_image_size( 'archive-thumbnail', 600, 140, true );
  add_image_size( 'single-thumbnail', 600, 260, true );
  add_image_size( 'featured-thumbnail', 600, 380, true );
  }
  add_action( 'after_setup_theme', 'child_theme_setup', 11 );  
  </code></pre>
  
  <p>Many thanks!</p>