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  // Enhance the default image displays if the Image module is enabled.

  if (module_exists('image')) {

    // Images should be displayed as unstyled images by default.

    $file_display = new stdClass();

    $file_display->api_version = 1;

    $file_display->name = 'image__default__file_field_image';

    $file_display->weight = 49;

    $file_display->status = TRUE;

    $file_display->settings = array(

      'image_style' => '',

      'image_link' => '',

    );

    $file_displays['image__default__file_field_image'] = $file_display;

    // Image previews should be displayed as image thumbnails by default.

    $file_display = new stdClass();

    $file_display->api_version = 1;

    $file_display->name = 'image__preview__file_field_image';

    $file_display->weight = 49;

    $file_display->status = TRUE;

    $file_display->settings = array(

      'image_style' => 'thumbnail',

      'image_link' => '',

    );

    $file_displays['image__preview__file_field_image'] = $file_display;

    // Image teasers should be displayed as medium images by default.

    $file_display = new stdClass();

    $file_display->api_version = 1;

    $file_display->name = 'image__teaser__file_field_image';

    $file_display->weight = 49;

    $file_display->status = TRUE;

    $file_display->settings = array(

      'image_style' => 'medium',

      'image_link' => 'content',

    );

    $file_displays['image__teaser__file_field_image'] = $file_display;

  }