if (asset instanceof ConvertibleImageAsset) {
String url = urlResult.getExternalForm();
// Construct the url for the convertible image asset.
ConvertibleImageAsset convertible = (ConvertibleImageAsset)asset;
PreservedArea area = PreservedArea.get(
convertible.getPreserveLeft(),
convertible.getPreserveRight(),
true);
String value = ContextInternals.constructImageURL(
requestContext, url, area);