Sora

Sora (空, Japanese for "sky") is the grade the rest of this library descends from, and it earned the name: most of its tuning was a fight for the sky. Log footage stores a bright sky as almost-gray, and the lazy fix is to detect that sky and swap in a nicer one. That shortcut is exactly what makes so many LUTs look like a filter. Sora deliberately has no sky detection at all. Blues are amplified like any other color, proportionally to what the camera actually caught, so a faint hazy sky becomes a believable pale one and a real blue sky goes full turquoise. The gradient always survives.

The rest of the character: a luminous lift, cold whites over warm red mids (the tension that makes a frame read "lit" rather than "filtered"), and a dedicated guard that keeps skin out of the saturation push. It was tuned across ten measured iterations against a reference grade on real Sapporo street footage, one harsh noon frame and one backlit evening one, matching the scopes rather than the pixels.