/**
 * The `Up` filter is just like the Sub() filter except that the pixel
 * immediately above the current pixel, rather than just to its left, is used
 * as the predictor.
 * `Up(x) = Raw(x) + Prior(x)`
 *
 * @param {Uint8Array} scanline raw data
 * @param {number} scanline_offset
 * @param {Uint8Array} pixels processed output
 * @param {number} offset
 * @param {number} output_offset_previous pass a negative value when there is no previous scanline
 * @param {number} length
 * @see https://www.w3.org/TR/PNG-Filters.html
 */
export function png_filter_unFilterUp(scanline: Uint8Array, scanline_offset: number, pixels: Uint8Array, offset: number, output_offset_previous: number, length: number): void;
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