The command-line version breaks down the --quality option into two sub-options (which default to the same value as --quality):

• --motion-quality=80 controls how aggressive temporal and spatial denoising is. Lower values make files smaller by reducing differences between frames, but too-low values will make animations look wobbly, jerky, or posterized.

• --lossy-quality=80 controls lossy LZW compression. Lower values make files smaller by skipping inconvenient-to-compress pixels, but too-low values will make animations look dithered and grainy.

• Experimental GUI for Windows.
  • it's very basic and unpolished. It only supports PNG frames, no video. No refunds!
• --fast option is faster on CPUs with 6 or more cores.

In previous versions of gifski animations with duplicate frames could have frame delay off by one.

• Avoids creating fuzzy edges when input has transparency with anti-aliasing
• --extra flag for extra-slow processing that makes slightly better palettes
• Fixed accuracy of error codes in the C API

Transparency in GIF is full of edge cases.

A week of debugging for a 1-line fix.

Rewrite of libimagequant in Rust enabled better Windows compatibility, and the Windows build is now over 2 times faster.

If you set --quality=80 or lower, it will use more transparent pixels for diffs between frames, which usually reduces file size.

When you use quality lower than 100, it now applies denoising. It's like smart blur, but not in regular 2D, but on the axis of time. This helps reduce file sizes of MPEG-compressed screencasts and low-motion videos with analog noise.