/**
 * Pixel-level image filters shared by the raster export paths (pdf-export,
 * pptx-export). Pure functions over an ImageData-like buffer — no DOM, no
 * konva. The canvas editor renders the SAME named effects via CSS/SVG
 * matrices in `filters.ts` (`shapeFilterToCSS`); the math intentionally
 * differs per medium, but each medium has exactly one implementation.
 *
 * `highlights` is an alias of `white` kept for hand-written design JSON
 * (the editor UI itself only emits the Effects enum names).
 */
export interface ImageDataLike {
    data: Uint8ClampedArray;
    width: number;
    height: number;
}
export type PixelFilter = (imageData: ImageDataLike) => ImageDataLike;
export declare const pixelFilters: Record<string, (intensity: number) => PixelFilter>;