Additive Color Demo

In class on Feb. 7, after a lecture on additive and subtractive color, we'll do an exercise together that illustrates the idea of additive RGB colors. By using the multiple exposure function on the Nikon D300, we took (3) 4 second frames at F22, ISO 200. Those 3 frames are then combined into one raw file in the D300 when on multiple exposure mode. During each exposure, someone popped a SB600 flash gelled with a different color. The flash was hand held off camera, set to manual mode and full output 1/1. During the first exposure, a red gelled flash was popped, then we moved the subject over slightly and popped a green gelled flash, then moved it over yet again and popped a blue gelled flash. The gels we used were from the free rosco sample packs, taped to the flash.

The resulting image, below, shows that yellow is made when red and green overlap, cyan is made when green and blue overlap and when red and blue overlap, magenta is created.



This image, shot by current students in class Feb 7, shows clearly how yellow is created when red and green are mixed.