Image exposure device and image exposure method

An image exposure method comprising:

• a step of preparing an image display device having pixels that emit light having a plurality of wavelengths;
• a step of preparing a photosensitive recording medium support portion that supports a photosensitive recording medium for recording an image of the image display device in a state in which an exposure surface of the photosensitive recording medium faces the image display device;
• and
• a step of exposing the exposure surface of the photosensitive recording medium to second transmitted light, through a collimation portion that is disposed between the image display device and the photosensitive recording medium support portion and makes radiation light including the light having a plurality of wavelengths radiated from the pixels into first transmitted light radiated within a range of a first radiation angle narrower than a radiation angle of the radiation light, and a dichroic filter that is disposed between the collimation portion and the photosensitive recording medium support portion and makes the first transmitted light including the light having a plurality of wavelengths into the second transmitted light radiated within a range of a second radiation angle equal to or smaller than the first radiation angle.