Most modern HDTVs and 4K TVs already scale lower-resolution video to the panel's native resolution. Many Blu-ray players and some DVD players also perform their own upscaling before sending the picture over HDMI. Because of this, a software-upscaled file is not automatically better than letting a good TV handle the job.
The most important point is that a 1080p or 4K output resolution does not create native HD or 4K detail. Upscaling estimates new pixels from the SD source. A well-processed result may look cleaner or more stable on a large screen, while an aggressive upscale can exaggerate compression artifacts, ringing, noise, or softness already present on the DVD.
For that reason, higher is not always better. 1080p is often a practical target for DVD upscaling. You can choose 2K, 4K, or higher when a particular device or workflow calls for it, but the extra pixels also increase processing time and file size without adding true source detail.













