What everyone has missed is that you can control the image resolution when using plot to web jpg, as a default it can be real average, simply you create a custom sheet size but work in pixels not say mm my sheets are like 6000x4000 as a size. Just work backwards take your required sheet size and use at least 200dpi as a start, dont get carried away like 600 dpi, this will just make real big jpg's and you will not see the pixelation. We have done A1 sheets and replotted and the you can not see the pixelation unless you get the magnifying glass out, we are plotting at 300 dpi on Hp Inkjet.