Hi, saulin. You're right - texture filtering was off. I just used the default PJ64 settings, as I'm not fiddling much with the options of N64 emulators (not as much as I fiddle with PSX ones, anyway
). So I turned it on and, the graphics smoothed out well enough - thanks for the tip !!
...as for the bult-in screenshot grabber, I wouldn't know - I never used it.