1. A projection control device comprising a hardware processor; wherein the hardware processor configured to; perform a projector to output a synthesis pattern light to a screen, wherein the synthesis pattern light comprising plurality of pattern light including light area of different wave range from each other; acquire a captured image includes the synthesis pattern light which has been outputted to the screen, wherein the captured image is captured by an image capture unit; and determine a relationship between projection pixels of the projector and pixels of the captured image of the image capture unit, on the basis of the synthesis pattern light on the captured image.