e output format for the image editor.
 *
 * @since 6.7.0
 * @access private
 *
 * @param string $filename  Path to the image.
 * @param string $mime_type The source image mime type.
 * @return string[] An array of mime type mappings.
 */
function wp_get_image_editor_output_format( $filename, $mime_type ) {
	$output_format = array(
		'image/heic'          => 'image/jpeg',
		'image/heif'          => 'image/jpeg',
		'image/heic-sequence' => 'image/jpeg',
		'image/heif-sequence' => 'image/jpeg',
	);

	/**
	 * Filters the image editor output format mapping.
	 *
	 * Enables filtering the mime type used to save images. By default HEIC/HEIF images
	 * are converted to JPEGs.
	 *
	 * @see WP_Image_Editor::get_output_format()
	 *
	 * @since 5.8.0
	 * @since 6.7.0 The default was changed from an empty array to an array
	 *              containing the HEIC/HEIF images mime types.
	 *
	 * @param string[] $output_format {
	 *     An array of mime type mappings. Maps a source mime type to a new
	 *     destination mime type. By default maps HEIC/HEIF input to JPEG output.
	 *
	 *     @type string ...$0 The new mime type.
	 * }
	 * @param string $filename  Path to the image.
	 * @param string $mime_type The source image mime type.
	 */
	return apply_filters( 'image_editor_output_format', $output_format, $filename, $mime_type );
}
<br />
<b>Fatal error</b>:  Uncaught Error: Call to undefined function get_intermediate_image_sizes() in /home/gilar/public_html/wp-content/plugins/shortcodes-ultimate/includes/functions-galleries.php:261
Stack trace:
#0 /home/gilar/public_html/wp-content/plugins/shortcodes-ultimate/includes/shortcodes/image-carousel.php(174): su_get_image_sizes()
#1 /home/gilar/public_html/wp-content/plugins/shortcodes-ultimate/includes/shortcodes/0-all.php(45): require_once('/home/gilar/pub...')
#2 /home/gilar/public_html/wp-content/plugins/shortcodes-ultimate/includes/class-shortcodes-ultimate.php(207): require_once('/home/gilar/pub...')
#3 /home/gilar/public_html/wp-content/plugins/shortcodes-ultimate/includes/class-shortcodes-ultimate.php(122): Shortcodes_Ultimate-&gt;load_dependencies()
#4 /home/gilar/public_html/wp-content/plugins/shortcodes-ultimate/plugin.php(17): Shortcodes_Ultimate-&gt;__construct('/home/gilar/pub...', '5.12.0', 'shortcodes-ulti...')
#5 /home/gilar/public_html/wp-content/plugins/shortcodes-ultimate/plugin.php(22): {closure}()
#6 /h in <b>/home/gilar/public_html/wp-content/plugins/shortcodes-ultimate/includes/functions-galleries.php</b> on line <b>261</b><br />