nx_lighting_consistency.nx

nx_lighting_consistency.nx -- subject lighting vs environment lighting match. Image #58 failure: subject (woman) appears lit by warm interior light but the environment (rainy window behind) is cool daylight. Body reads as "pasted in" — a compositing seam. Real cinematography keeps subject + environment under the SAME light temperature + direction. Math: Compute color temperature proxy for subject (skin region) and environment (background region) via R:B ratio and mean luminance. Compute light direction proxy via brightness gradient across each. Score the MATCH between the two readings. Inputs: rgb image + skin_mask + environment bbox (background region). Output flat-array: result[0] = subject_R_to_B_q10 warm/cool proxy result[1] = env_R_to_B_q10 result[2] = temp_match_q10 1024 = perfect match result[3] = subject_brightness mean Y in skin result[4] = env_brightness result[5] = direction_match_q10 1024 = same light direction result[6] = composite_q10 result[7] = verdict 0=COMPOSITING_SEAM / 1=INCONSISTENT / 2=ACCEPTABLE / 3=COHERENT