export declare function unfilter1(xComparison: number, dest: Uint8Array, offset: number, byteWidth: number): void;
export declare function unfilter2(dest: Uint8Array, offset: number, previousLineOffset: number | undefined, byteWidth: number): void;
export declare function unfilter3(xComparison: number, dest: Uint8Array, offset: number, previousLineOffset: number | undefined, byteWidth: number): void;
export declare function unfilter4(xComparison: number, dest: Uint8Array, offset: number, previousLineOffset: number | undefined, byteWidth: number): void;