Transmission type color gradation chart, transmission type color gradation chart device and gray gradation chart

A method for color calibrating an imaging device, the method comprises:

• preparing a transmission type color gradation chart including a color chart member including at least one color bar wherein transmitted light exhibits chromatic color, and a gray gradation chart member wherein transmitted light exhibits achromatic color, and includes a plurality of transmission regions with different brightness, wherein the color chart member and the gray gradation chart member are stacked so that there is a duplicative transmission region wherein the color bar and the plurality of transmission regions overlap in planar view;
• a lighting equipment;
• and an imaging device;
• photographing an image of the transmission type color gradation chart, with the imaging device, from one surface side of the transmission type color gradation chart by irradiating light, using the lighting equipment as a light source, from another surface side of the transmission type color gradation chart;
• and
• color calibrating the imaging device based on the photographed image photographed with the imaging device.