If you want 4K resolution for your DCP, your source material will have to be in 4K as well.
Simply upscaling your source video won’t lead to better results.
| Container | Aspect Ratio | 2K Resolution | 4K Resolution |
|---|---|---|---|
| Flat | 1.85:1 | 1998 x 1080 px | 3996 x 2160 px |
| Scope | 2.39:1 | 2048 x 858 px | 4096 x 1716 px |