Up until recently, we were not able to render high-resolution still images in Unreal Engine. Luckily for us, Epic Games have now added a high-resolution renderer called "Movie Render Queue".
It works by overriding the default anti-aliasing - which gives that low-quality "step" effect to your image - and increasing the temporal sample count (how many times the image will be rendered stacked on top of the other) to give a smooth final image.
Watch the video to find out how to render a huge still image without anti-aliasing issues in Unreal Engine:
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