imagesexcertp

function pietergoosen_excerpt_175_words( $length ) {
    return 175;
}
add_filter( 'excerpt_length', 'pietergoosen_excerpt_175_words' );

function pietergoosen_get_first_image() {
        global $post;
        $first_img = '';
        if( $output = preg_match_all('/<img.+src=[\'"]([^\'"]+)[\'"].*>/i', $post->post_content, $matches))
        $first_img = $matches [1] [0];

        return $first_img;
    }

function pietergoosen_check_if_url_exist($url) {
    $headers = wp_get_http_headers($url);

    if (!is_array($headers)) :
        return FALSE;
    elseif (isset($headers["content-type"]) && (strpos($headers["content-type"],"image") !== false)) :
        return TRUE;
    else :
        return FALSE;
    endif;
}
function pietergoosen_adjust_image_size($image, $alt, $newwidth, $newheight) {
    if (!file_exists($image) && !pietergoosen_check_if_url_exist($image)) return '';
    list($width, $height, $type, $attr) = getimagesize($image);
    if (!$width || !$height) return '';

    if ($newwidth)
        $newheight = intval($newwidth/$width * $height);
    else
        $newwidth = intval($newheight/$height * $width);
    return '<img src="' . $image . '" width=' . $newwidth . ' height='. $newheight . ' alt=' . $alt . '/>';
}

<div class="alignleft-excerpt">
            <a href="<?php echo pietergoosen_get_first_image() ?>" title="<?php printf( the_title_attribute( 'echo=0' ) ); ?>" rel="lightbox">
              <?php echo pietergoosen_adjust_image_size(pietergoosen_get_first_image(), get_the_title(), 250, 0); ?>
           </a>
       </div>