Hi Everyone. I have a Canon ipf710. I am trying to print posters on canvas but I'm finding the dark colours are coming out too light. What should be areas of jet black are coming out brown. I have tried printing with the glossy photo paper setting, the matte photo paper & also the special 1 setting(all set to the highest quality setting) Does anyone know the correct settings for printing on 280gsm canvas before I waste too much canvas with trial & error! Your help would be greatly appreciated.