add_action( 'admin_enqueue_scripts', 'wptuts_add_color_picker' );
function wptuts_add_color_picker( $hook ) {
 
    if( is_admin() ) { 
     
        // Add the color picker css file       
        wp_enqueue_style( 'wp-color-picker' ); 
         
        // Include our custom jQuery file with WordPress Color Picker dependency
        wp_enqueue_script( 'custom-script-handle', plugins_url( 'custom-script.js', __FILE__ ), array( 'wp-color-picker' ), false, true ); 
    }
}