There is an easier way to include the image associated with your node in a Drupal Views RSS feed. No additional modules are required.
Firstly you need to add the Media RSS namespace to your views-view-rss.tpl.php:
<rss version="2.0" xml:base="<?php print $link; ?>"<?php print $namespaces; ?> xmlns:media="http://search.yahoo.com/mrss/">
Secondly, in the row style template for your RSS feed (mine is called views-view-row-rss–market-news-rss-feed–feed.tpl.php), you need add a media element, and enter your image field name, your image style, and your dimensions:
<?php
/**
* @file
* Default view template to display a item in an RSS feed.
*
* @ingroup views_templates
*/
?>
<item>
<title><?php print $title; ?></title>
<link><?php print $link; ?></link>
<description><?php print $description; ?></description>
<media:content url="<?php print image_style_url('news_old_style__300x250_', $node->field_image['und'][0]['uri']); ?>" type="image/jpeg" medium="image" height="250" width="300" lang="en" />
<?php print $item_elements; ?>
</item>
Lastly, make the field data available to the template above by adding the following to your template.php
function nadex_preprocess_views_view_row_rss(&$vars) {
$view = &$vars['view'];
$options = &$vars['options'];
$item = &$vars['row'];
// Use the [id] of the returned results to determine the nid in [results]
$result = &$vars['view']->result;
$id = &$vars['id'];
$node = node_load( $result[$id-1]->nid );
$vars['node'] = $node;
}
Thanks to these guys for the inspiration: