I will try remove 100% off black ,never try before ,always 40-50% in RIP options and removing background in photoshop and conver to png or pds is work as well .Thanks .....Martin I am using a program called "Rip Pro" it is version 6 it is for any Epson 4880 and may support other Epson models. It is from a company called Iproof Systems. This RIP came with the printer.
I am using a .PNG file to print from the designs were created in Photoshop without using any black so black was not needed to be removed.
However if you are printing on Black I do suggest 100% trying to remove as much black from your graphics as possible even if your RIP lets you "remove" black I find it still is not that great.
Hope this helps!