As you probably know, GIF is limited to a palette of 256 colors. And bydefault, FFmpeg just uses a generic palette that tries to cover the wholecolor space in order to support the largest variety of content:
As you probably know, GIF is limited to a palette of 256 colors. And bydefault, FFmpeg just uses a generic palette that tries to cover the wholecolor space in order to support the largest variety of content: