// Enable support for post-thumbnails
add_theme_support('post-thumbnails');
// If we want to ensure that we only call this function if
// the user is working with WP 2.9 or higher,
// let's instead make sure that the function exists first
if ( function_exists('add_theme_support') ) {
add_theme_support('post-thumbnails');
}
// Insertar dentro de index.php //
<?php the_post_thumbnail(); ?>
// name of the thumbnail, width, height, crop mode
add_image_size( 'post-image', 300, 180, true ); // post image shown in main blog feed
add_image_size( 'featured-image', 652, 245, true ); // large post thumbnail shown in the Featured section
add_image_size( 'slide-image', 900, 300, true ); // really large image for the main front-page slider
add_image_size( 'slide-image-small', 200, 200, true ); // small square image shown in carousel slider in footer
add_image_size( 'latest-post-widget', 80, 80, true ); // really small square shown for latest posts widget
add_image_size( 'related-posts', 180, 180, true );
the_post_thumbnail('post-image'); // replace post-image with the name of your thumbnail, as declared above
if(has_post_thumbnail()) {
the_post_thumbnail('featured-image');
} else {
// show a default image if no thumbnail is set
echo '<img src="path/to/yourimage/jpg" />';
}