Create new image sizes for custom post types

By default WordPress creates three images sizes for every picture uploaded to your media library. If you want to create a new size for custom post types you can copy this code to your functions file. So instead of using “thumbnail” you can use “your_image_size_1” or whatever you decide. Make sure to set values for your new size with the add_image_size function

 * Snippet Name: Create new image sizes for custom post types
 * Snippet URL:
  add_filter( 'intermediate_image_sizes', 'ravs_slider_image_sizes', 999 );
function ravs_slider_image_sizes( $image_sizes ){

    // size for slider
    $slider_image_sizes = array( 'your_image_size_1', 'your_image_size_2' ); 

    // for ex: $slider_image_sizes = array( 'thumbnail', 'medium' );

    // instead of unset sizes, return your custom size for slider image
    if( isset($_REQUEST['post_id']) && 'your_custom_post_type' === get_post_type( $_REQUEST['post_id'] ) )
        return $slider_image_sizes;

    return $image_sizes;

// to create a custom size you can use this:
   add_image_size('your_image_size_1',100,100,true); // Crop mode
   add_image_size('your_image_size_2',400,500); // Resize mode 

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