public override SortedDictionary<string, object> ToParamsDictionary()
{
SortedDictionary<string, object> dict = base.ToParamsDictionary();
if (MaxResults > 0)
AddParam(dict, "max_results", MaxResults.ToString());
AddParam(dict, "exif", Exif);
AddParam(dict, "colors", Colors);
AddParam(dict, "faces", Faces);
AddParam(dict, "image_metadata", Metadata);
AddParam(dict, "phash", Phash);
AddParam(dict, "coordinates", Coordinates);
return dict;
}