Dot gain calculation device, dot gain calculation method, and dot gain calculation program

摘要

PROBLEM TO BE SOLVED: To provide a dot gain calculation device or the like capable of easily calculating an optical dot gain without requiring the preparation of a dot as a comparison object every measurement.SOLUTION: An image obtained by imaging a dot portion is converted into a binarized image, and an input dot area ratio Ais subtracted from a dot area ratio Ain the binarized image, thereby obtaining a mechanical dot gain. The mechanical dot gain is subtracted from a total dot gain obtained by subtracting the input dot area ratio Afrom a dot area ratio A obtained by measuring the dot portion with a reflection densitometer or the like. Thus, an optical dot gain is obtained.SELECTED DRAWING: Figure 5