Winterhuman

#!/bin/sh

# Licensed under the Zero-Clause BSD terms: https://opensource.org/license/0bsd
# Requires pngquant, oxipng, gifsicle, gif2apng, libwebp, and optionally perl-image-exiftool.

perr() { printf "\033[1m\033[31m%b\033[0;39m" "$1"; }
pquit() { perr "$1"; exit 1; }
pstat() { printf "\033[1m\033[34m%b\033[0;39m\033[1m%b\033[0;39m\n" "$1" "$2"; }
clean() { if ! rm -r "$tmp"; then pquit "Failed to delete '$tmp'!\n"; fi }

Winterhuman

# 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

#!/bin/sh

# Licensed under the Zero-Clause BSD terms: https://opensource.org/license/0bsd
# Requires imagemagick, and optionally pngquant & optipng
#
# Argument 1: Number of pixels to fill, required.
# Argument 2: Height ratio, default 23.
# Argument 3: Width ratio, default 5.

pquit() { printf "\033[1m\033[31m%b\033[0;39m" "$1"; exit 1; }

Winterhuman

#!/bin/sh

# Licensed under the Zero-Clause BSD terms: https://opensource.org/license/0bsd
# Requires `imagemagick` and `cavif`.

## Arguments
# 1: /path/to/input
# 2: /path/to/output (optional, default output: 'input_no_ext'-'quality'.avif)
# 3: Target SSIM value (default value: 96%)
#	Since the SSIM score is output as a 6 decimal place number (e.g. 0.960000),