Patent ID: 8047627

Claim:
An inkjet printing correction method for use with an inkjet printing apparatus, said an inkjet printing apparatus comprising multiple ink cartridges for storing ink and multiple ink nozzles for ejecting ink, said inkjet printing correction method comprising steps of: printing out a first test image file as a print test pattern by said inkjet printing apparatus, wherein said first test image file comprises multiple first blocks, every two adjacent first blocks are distant from each other by a first block interval, said print test pattern comprises multiple physical blocks, and every two adjacent physical blocks are distant from each other by a physical block interval; scanning said print test pattern with a scanning module of said inkjet printing apparatus to obtain a second test image file, wherein said second test image file comprises multiple second blocks, every two adjacent second blocks are distant from each other by a second block interval; comparing all second block intervals with respective first block intervals, thereby obtaining corresponding comparing results; and determining whether a procedure of ejecting ink droplets from said ink nozzles is advanced or delayed according to said comparing results, wherein if any first block interval is smaller than a corresponding second block interval, said procedure of ejecting ink droplets from the ink nozzles is advanced, or if any first block interval is larger than a corresponding second block interval, said procedure of ejecting ink droplets from the ink nozzles is delayed.