Risograph isn’t too different from screenprinting, because it’s just about printing in positive and negative space where you want ink to be pushed through the screen. Just like Riso, screenprinting is made up of values and sending a black and white image to be burnt into the screen.
But with Riso you don’t have to do any pulling or burning, it’s all done inside the machine for you. It’s not too different from copy printing because you’re just sending information to the machine and waiting for it to print, but what comes out of the printer looks like a vintage lithograph or woodblock print – or can sometimes even look like it was made with traditional media.
Read more at https://www.digitalartsonline.co.uk/features/illustration/risograph-printing-techniques-tips/