Printing apparatus and control method therefor

A printing apparatus comprising:

• a printhead including a plurality of nozzles each configured to discharge ink, a plurality of energy generating elements respectively provided in the plurality of nozzles and each configured to generate energy used for discharging the ink from the nozzle, a plurality of detection elements provided in correspondence with the plurality of energy generating elements, and an output portion configured to output a signal indicating ink discharge statuses of the plurality of nozzles using the plurality of detection elements;
• an inspection unit configured to inspect the ink discharge status while changing a threshold for judging the discharge status of a target nozzle based on the signal output by the output portion;
• an obtaining unit configured to obtain, for the target nozzle, information concerning a change point at which a judgment result obtained by inspecting the ink discharge status by the inspection unit changes;
• a calculation unit configured to calculate a difference value between a value obtained by statistics of information obtained by the obtaining unit for a plurality of nozzles close to the target nozzle and the information obtained by the obtaining unit for the target nozzle;
• a comparison unit configured to compare the difference value calculated by the calculation unit with a predetermined threshold;
• and
• a judgment unit configured to judge the ink discharge status for the target nozzle based on a result of the comparison by the comparison unit.