Changeing the resolution on a few Emulators

So I have figured out how to increase the resolution on gamecube and ps2 but I am having issues figuring out how to increase the resolution on n64 and ps1. I would alt tab to get into the actual emulator then find the settings in there. I am really stuck on n64 and with my system I was hoping to increase some of the blur. Does anyone know how I can do this?

Thank you

What kind of display are you using? I find on these modern screens those older systems look much better in 4:3 with a bezel. I don't know if Chris added it yet but I think I convinced him to add a bezel set for the rest of the systems. If not at launchbox you can find a unified bezel set. I set displays to 4:3 for those consoles, enabled bezels for them, changed ps1 to retroarch, and set up rumble for all rumble-compatible consoles. I am very happy with the outcome. It looks much better on my 80 inch projection screen now.