Higher color bit depth. HDMI 1.3 supports 48-bit color depth. DVI supports only 24-bit (VGA, S-Video, and component signals are analog so this measure doesn’t apply). This higher color bit depth allows for smoother color gradations without unwanted color banding.
Both YCbCr and RGB color space support. The YCbCr color space is better for transporting decompressed [...]
"Advantages of HDMI" - 17.12.06