Reading device, image forming apparatus, and color mixture prevention method

A reading device comprising:

• a first light source configured to emit light;
• a second light source configured to emit light in a wavelength of light different from a wavelength of light of the first light source;
• circuitry configured to instruct the first light source and the second light source to turn on and turn off;
• a first light-intensity adjuster configured to adjust light intensity of the first light source based on a first light intensity value;
• a second light-intensity adjuster configured to adjust light intensity of the second light source based on a second light intensity value;
• a first image sensor configured to receive the light that is emitted from the first light source and is reflected by an object;
• and
• a second image sensor configured to receive the light that is emitted from the first light source and the second light source and is reflected by the object,
• the circuitry being configured to set a light intensity value that satisfies a first light intensity condition as the first light intensity value, based on data output from the first image sensor while the first light source is turned on, the circuitry being configured to set a light intensity value that satisfies a second light intensity condition as the second light intensity value, based on data output from the second image sensor while the first light source is turned on.