Image processing apparatus, threshold matrix generation apparatus, control methods therefor, and non-transitory computer-readable storage medium

Abstract

An image processing apparatus converts, based on a threshold matrix in which thresholds are arrayed, input image data into a first dot pattern representing dots recorded by a recording head, and obtains a second dot pattern representing dots recorded by each of L number of the nozzle arrays by assigning the dots of the first dot pattern to each of the nozzle arrays so that each nozzle of the recording head is used in a cycle of L. A power spectrum in a frequency domain of the first dot pattern has a blue noise characteristic or a green noise characteristic in which power in a low frequency band is suppressed, and power is suppressed at a frequency corresponding to the cycle of L and at frequencies of multiplications of the frequency.