std::string autocrop::arguments (const context& ctx) { using std::string; string argv; // Set up input data characteristics argv += " " + lexical_cast< string > (lo_threshold_ / 100); argv += " " + lexical_cast< string > (hi_threshold_ / 100); argv += " crop"; argv += " " + lexical_cast< string > (ctx.octets_per_image () + PNM_HEADER_SIZE); return argv; }