Grid Image

/**
 * Grid Image Sizes 
 *
 */
function be_grid_image_sizes() {
	add_image_size( 'be_grid', 175, 120, true );
	add_image_size( 'be_feature', 570, 333, true );
}
add_action( 'genesis_setup', 'be_grid_image_sizes', 20 );

/**
 * Grid Loop Featured Image
 *
 * @param string image size
 * @return string
 */
function be_grid_loop_image( $image_size ) {
	global $wp_query;
	$grid_args = be_grid_loop_pagination();
	if( ! $grid_args )
		return $image_size;
		
	// Feature
	if( ( ! $wp_query->query_vars['paged'] && $wp_query->current_post < $grid_args['features_on_front'] ) || ( $wp_query->query_vars['paged'] && $wp_query->current_post < $grid_args['features_inside'] ) )
		$image_size = 'be_feature';
		
	if( ( ! $wp_query->query_vars['paged'] && $wp_query->current_post > ( $grid_args['features_on_front'] - 2 ) ) || ( $wp_query->query_vars['paged'] && $wp_query->current_post > ( $grid_args['features_inside'] - 1 ) ) )
		$image_size = 'be_grid';
		
	return $image_size;
}
add_filter( 'genesis_pre_get_option_image_size', 'be_grid_loop_image' );