The proper way to scale pixel graphics is by using nearest-neighbor (integer scaling) + CRT shader. Some games implement these filters excellently (eg Black Jewel, Hammerwatch (only the very first part), Animal Well), while others do it poorly (eg Skald).
Old consoles can be connected to an LCD monitor using a device called RetroTINK, which can add this effect perfectly. For static images, software like Photoshop, Affinity Photo is sufficient, but the goal should always be a CRT effect rather than generic scaling or fancy blur.
The point is that OBJECTIVELY pixel art looks incomparably better on CRT monitors, which is why this effect is emulated.
Old consoles can be connected to an LCD monitor using a device called RetroTINK, which can add this effect perfectly. For static images, software like Photoshop, Affinity Photo is sufficient, but the goal should always be a CRT effect rather than generic scaling or fancy blur.
The point is that OBJECTIVELY pixel art looks incomparably better on CRT monitors, which is why this effect is emulated.