Glossiness determining device, color measuring device, image forming apparatus, and glossiness determination method

A glossiness determination method performed by a glossiness determining device that includes a light source, a two-dimensional sensor, and a determining unit, the glossiness determination method comprising:

• receiving reflected light containing a specular reflection component of a subject illuminated by the light source as an amount of light emitted from the light source onto the subject varies, and outputting an image of the subject by the two-dimensional sensor;
• and
• determining, by the determining unit, glossiness of the subject by using a saturated image, which is the image of the subject output by the two-dimensional sensor and in which pixel values of a partial area are saturated.