Lossless GIF recompression via exhaustive search
6 hours ago
- #image compression
- #GIF optimization
- #browser compatibility
- GIF is the oldest compressed image format, used for animations but also crucial for compatibility with ancient browsers like Mosaic, Netscape, and IE.
- Modern websites should ideally use SVG and WebP, but GIF remains a fallback option, despite its poor compression compared to newer formats.
- To optimize GIFs, one can strip metadata and reduce palette colors, but actual compression improvements require advanced techniques like Zopfli for PNG.
- FlexiGIF attempts to optimize GIFs using LZW compression with flexible parsing, but it may sometimes produce larger files due to wasted dictionary slots.
- ZGIF is a custom tool exploring exhaustive LZW compression optimizations, though it's slow; pruning search to one-step lookahead significantly speeds it up while still outperforming existing methods.