Reference an Image from a Scald ID
Found a way – this is how to retrieve image url and image html from given sid:

if(isset($vars['node']-&gt;field_teaserbild['und'][0]['sid'])) {

    $img = $vars['node']-&gt;field_teaserbild['und'][0]['sid'];
    $atom = scald_atom_load($img);
    $image_uri = $atom-&gt;base_entity-&gt;uri;
    $vars['img_style_url'] = image_style_url('my_img_style', $image_uri); // style_url
    $vars['img_html'] = theme('image_style', array('style_name' =&gt; 'my_img_style', 'path' =&gt; $image_uri)); // html

}


Just in case somebody is still hoping for an answer…