Wordpress post thumbnails featured image reference

wordpress-post-thumbs.php

<?php add_theme_support( 'post-thumbnails' ); // Add theme post thumbnails support ?> 

<?php the_post_thumbnail(); // Display post thumbnail ?> 

<?php set_post_thumbnail_size( 50, 50, true ); // 50 pixels wide by 50 pixels tall, crop mode // Set post thumbnail to 50 x 50 and does a hard crop ?>

<?php add_image_size( 'custom-thumb', 300, 9999 ); //300 pixels wide (and unlimited height) // Set post thumbnail to 300 x any height, no cropping ?>

<?php if ( has_post_thumbnail() ) { the_post_thumbnail( 'custom-thumb' ); } else { ?> <img src="<?php bloginfo('template_directory');?>/img/thumb-default.png" alt=""/> <?php } ?>