grainy colours

Hello, I recently purchased an Epson XP-15000. In my prints no matter what setting or media I'm choosing I seem to be getting "grainy" images especially in lighter areas of the prints. I have attached photos comparing the Epson against a pro-100 and the original source image When looking up...

Hi! Hoping for some help/advice. I am using a Canon Inkjet MP499 and using Canon Inks and am having trouble with some colours printing grainy. I've attached an example, the dark green and blue on the left show this problem. Whereas the light blue on the right looks fine! I am using a textured...