WordPress Featured Image Support and New Image Sizes

/* FEATURED IMAGE SUPPORT */
if ( function_exists( 'add_theme_support' ) ) {
    add_theme_support( 'post-thumbnails' );
}
/* ADD NEW IMAGE SIZES */
if ( function_exists( 'add_image_size' ) ) {
    add_image_size( 'new-image-name', 640, 480, true ); // (cropped)
}