/**
 * The `Sub` filter transmits the difference between each byte and the value
 * of the corresponding byte of the prior pixel.
 * `Sub(x) = Raw(x) + Raw(x - bpp)`
 *
 * @param {Uint8Array} scanline raw data
 * @param {number} scanline_offset
 * @param {Uint8Array} pixels processed output
 * @param {number} bpp bytes-per-pixel
 * @param {number} offset
 * @param {number} length
 * @see https://www.w3.org/TR/PNG-Filters.html
 */
export function png_filter_unFilterSub(scanline: Uint8Array, scanline_offset: number, pixels: Uint8Array, bpp: number, offset: number, length: number): void;
//# sourceMappingURL=png_filter_unFilterSub.d.ts.map