Evaluation method and evaluation device for roughening treatment of metal surface

A step S2 of acquiring image data of a surface of an inspection object subjected to roughening treatment, a step S7 of calculating an NDSI value in each pixel of the image data with respect to light of two wavelengths selected in advance on the basis of the image data, and steps S8-S12 of evaluating the roughening treatment of the inspection object on the basis of the NDSI values are executed. 执行：取得实施了粗糙面处理的检查对象的表面的图像数据的步骤S2、基于上述图像数据关于预先选定的2个波长的光来计算上述图像数据的各像素中的NDSI值的步骤S7、以及基于上述NDSI值来进行与检查对象的粗糙面处理相关的评价的步骤S8～S12。