摘要 |
PROBLEM TO BE SOLVED: To acquire a correction value for each recording element using a reader having a lower resolution than the resolution of the recording element.SOLUTION: A correction value acquisition method includes: a test pattern recording step of recording a test pattern on a recording medium by a first resolution, a read gradation value acquisition step of reading the recorded test pattern and acquiring a read gradation value with a second resolution lower than the first resolution, a read mean place calculation step of calculating a read mean place of a ruled line group in a second direction based on the acquisition results in the read gradation value acquisition step, a resolution conversion step of subjecting the read gradation value with the second resolution to resolution conversion to the read gradation value with the first resolution by matching the calculated read mean place and the mean place of the ruled line group on the test pattern recorded on the recording medium, and a correction value acquisition step of acquiring a correction value for each line region based on the read gradation value subjected to resolution conversion. |