问题： 论文中的彩图一定要额外的付费吗？

我不是很了解这句话：Color art will be reproduced in color in the online publication at no additional cost to the author. Color illustrations will also be considered for print publication; however, the author will be required to bear the full cost involved in color art reproduction. Please note that color reprints can only be ordered if print reproduction costs are paid，这是说如果论文接受后一定要付这笔钱，还是说论文送印的时候要付费？请帮忙。