While 4K is the modern standard, Slumdog Millionaire was finished in a 2K Digital Intermediate (DI). A 4K upscale offers minimal improvement over a properly encoded 1080p rip. 1080p is the "native" resolution for this film. At this resolution, you can see the dirt on Jamal’s face in the Taj Mahal scene and the individual beads of sweat on Anil Kapoor’s forehead as the host, Prem Kumar.
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Unlike older x264 encodes, x265 (High Efficiency Video Coding) provides superior data compression. This allows the file to maintain high visual fidelity—retaining the film's vibrant colors and gritty textures—while having a significantly smaller file size. Encoder (RBG):