export interface SkinGradeColorBalance {
    shadows: [number, number, number];
    midtones: [number, number, number];
    highlights: [number, number, number];
}
export interface SkinGradeSelectiveColor {
    reds: [number, number, number, number];
    yellows: [number, number, number, number];
}
export interface SkinGradeEq {
    saturation: number;
    contrast: number;
    brightness: number;
}
export interface SkinGradeCdl {
    slope: [number, number, number];
    offset: [number, number, number];
    power: [number, number, number];
    saturation: number;
}
export interface SkinGrade {
    colorbalance: SkinGradeColorBalance;
    selectivecolor: SkinGradeSelectiveColor;
    eq: SkinGradeEq;
    cdl: SkinGradeCdl;
    /** Confidence 0-1; below 0.4 means "I'm guessing" — don't apply blindly. */
    confidence: number;
    /** ≤120 char rationale. */
    why: string;
}
export interface SkinGradeOptions {
    apiKey?: string;
    model?: string;
    detail?: "low" | "high";
    signal?: AbortSignal;
}
export declare function deriveSkinGrade(referenceFramePath: string, targetFramePath: string, opts?: SkinGradeOptions): Promise<SkinGrade>;
/**
 * Parse a model JSON response into a SkinGrade with all values clamped to
 * safe ranges. Tolerates missing fields (falls back to neutral) and prose
 * wrapping around the JSON.
 */
export declare function parseSkinGradeResponse(content: string): SkinGrade;
/**
 * Build the ffmpeg `-vf` filter string for a SkinGrade. Returns an empty
 * string when the grade is effectively neutral (no-op pass-through).
 */
export declare function buildSkinGradeFilter(grade: SkinGrade): string;
export interface ApplySkinGradeOptions {
    videoCodec?: string;
    crf?: number;
    signal?: AbortSignal;
}
/**
 * Spawn ffmpeg to render `inputPath` through a SkinGrade filter chain into
 * `outputPath`. Audio is copied. Returns the absolute output path.
 *
 * If the grade is effectively neutral, ffmpeg still re-encodes (since the
 * caller asked for an output file) but with no `-vf` filter.
 */
export declare function applySkinGrade(inputPath: string, outputPath: string, grade: SkinGrade, opts?: ApplySkinGradeOptions): Promise<string>;
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