https://www.youtube.com/watch?v=gJ2HOj22gDo

Complete psuedo-science garbage. Why does /ic/ look up to this guy again?

The reason why some hues become "darker" when converted to grayscale is because of the software itself using a shitty conversion algorithm, and not because of something that is physically intrinsic to colors.

Show this video to any master painter and they would fucking laugh at this clown. And to think the sticky reccomends his shitty courses.