export type Brightness = "dark" | "normal" | "bright";
export type Contrast = "low" | "normal" | "high";
export interface ImageHistogram {
    red: number[];
    green: number[];
    blue: number[];
}
export interface HistogramStats {
    mean: number;
    median: number;
    mode: number;
    standardDeviation: number;
    skewness: number;
    peakCount: number;
    dynamicRange: number;
}
export interface HistogramAnalysis {
    red: HistogramStats;
    green: HistogramStats;
    blue: HistogramStats;
    overall: {
        brightness: Brightness;
        contrast: Contrast;
        colorCast: string;
        exposureIssues: string[];
    };
}
/**
 * Calculate histogram for an image
 */
export declare function calculateHistogram(imagePath: string): Promise<ImageHistogram>;
/**
 * Calculate histogram for image buffer
 */
export declare function calculateHistogramFromBuffer(imageBuffer: Buffer): Promise<ImageHistogram>;
/**
 * Analyze histogram to provide insights about the image
 */
export declare function analyzeHistogram(histogram: ImageHistogram): HistogramAnalysis;
/**
 * Format histogram data for LLM consumption
 */
export declare function formatHistogramForLLM(histogram: ImageHistogram, analysis: HistogramAnalysis): string;