enum exif uint lossy octree png quantizer unzig cb cr Laplacian Sobel Scharr rgb rgba rrggbb rrggbbaa scanline scanlines png's codeword unscaled zig-zag crc zlib xff xda ss Vol pp cmyk Paeth th bool bools desensitivity premultiplied endianness thresholding James Jackson-South Copyright © James Jackson-South and contributors. Licensed under the Apache License, Version 2.0.