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Winterhuman
/ avif.sh
Last active
May 11, 2025 07:10
POSIX sh script to create AVIF for a target SSIM score using binary search, requires `imagemagick` and `cavif`.
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| #!/usr/bin/env -S unshare --mount --map-root-user /bin/sh | |
| # Licensed under the Zero-Clause BSD terms: https://opensource.org/license/0bsd | |
| ## Requires `imagemagick` and `cavif` | |
| ## -C: Fail if redirects try to overwrite an existing file. | |
| ## -e: Fail if any command fails (with exceptions). | |
| ## -u: Fail if an unset variable tries to be expanded. | |
| ## -f: No glob expansion. |
Winterhuman
/ ppm2png.sh
Last active
April 27, 2025 15:48
A script which finds the minimum PNG dimensions for a given aspect ratio and pixel count, creates a colour-cycling PPM file, and then converts it to PNG.
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| #!/usr/bin/env -S unshare --mount --map-root-user /bin/sh | |
| # Licensed under the Zero-Clause BSD terms: https://opensource.org/license/0bsd | |
| # Requires: imagemagick & [sisyphus](https://gist.github.com/Winterhuman/21d7b148db40ff041f397b07a7aafb83) | |
| # | |
| # Argument 1: Number of pixels to fill, required | |
| # Argument 2: Height ratio, default 23 | |
| # Argument 3: Width ratio, default 5 | |
| set -Ceuf |
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| # Explanation | |
| PNGQuant: `pngquant --quality 100-100 --speed 1 --strip` | |
| OxiPNG: `oxipng --opt max --strip all --alpha` | |
| OxiPNG-ZF: `oxipng --opt max --strip all --alpha --zopfli` | |
| Oxi-Quant: "PNGQuant" > "OxiPNG" (non-ZF) |
Winterhuman
/ sisyphus.sh
Last active
March 4, 2025 22:20
A script for finding the smallest lossless encoding of a PNG or GIF input image (that I know of).
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| #!/usr/bin/env -S unshare --pid --mount-proc --kill-child --map-root-user /bin/sh | |
| # Licensed under the Zero-Clause BSD terms: https://opensource.org/license/0bsd | |
| ## Requires pngquant, oxipng, gifsicle, gif2apng, and optionally libwebp & | |
| ## perl-image-exiftool | |
| ## -C: Fail if redirects try to overwrite an existing file. | |
| ## -e: Fail if any command fails (with exceptions). | |
| ## -u: Fail if an unset variable tries to be expanded. |