ba69c08676
* Correct an optimization bug introduced in 1.76. Reported by Tom Roostan. * Major improvements to color selection (important when reducing colormap size). Use gamma-corrected colors in selection and dithering; this makes image quality much better. Also, when reducing colors with dithering, prefer to select colors that dithering can't approximate. * Add ordered dithering modes, which avoid animation artifacts. The default ordered dithering mode (`--dither=ordered`) is a novel mode that combines some of the visual advantages of error diffusion with the artifact avoidance of ordered dithering. * Add halftone dithering (`--dither=halftone`). * gifview: Improved cache memory management for better animations. Collect memory for old frames based on an explicit --memory-limit (default 40MB). * gifview: Add `--fallback-delay` option, to specify a fallback delay for frames with delay 0. Thanks to Sung Pae. * Fix `-O2` crashes introduced with `--resize` improvements. Reported by Bryan Stillwell. * Improve `--careful` (fewer crashes). Reported by Bryan Stillwell. * Improve `-O2`: again, don't refuse to optimize images with local color tables. Reported by Bryan Stillwell. * Greatly improve `--dither` speed. * Improve `--resize` behavior: avoid animation artifacts due to different rounding decisions. Also speed it up. Reported by Bryan Stillwell. * Fix bug where `-O2` would refuse to optimize some images with local color tables, claiming that "more than 256 colors were required". What was really required is previous disposal. Reported by Bryan Stillwell. * Fix crash bugs on some combinations of `--crop` and `--resize` (prevalent on images whose first frame didn't cover the whole logical screen). Reported by Bryan Stillwell. |
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