augustkline.com/compress.sh

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#!/bin/bash
# Directory containing the images
input_dir="./public"
output_dir="./public/tmp"
rm -rf ${output_dir}
mkdir -p ${output_dir}
for input_file in "$input_dir"/*; do
if [ -f "$input_file" ]; then
filename=$(basename "$input_file")
extension="${filename##*.}"
output_file="${output_dir}/${filename}"
case "$extension" in
jpg)
# local max=65536
if [ $(stat -f%z "${input_file}") -gt 65536 ]; then
magick "${input_file}" -resize 30% "${output_file}"
while [ $(stat -f%z "$output_file") -gt 65536 ]; do
echo "Processing JPEG file: $output_file"
magick "${output_file}" -resize 30% "${output_file}"
done
fi
mv "${output_file}" "${input_file}"
;;
gif)
if [ $(stat -f%z "$input_file") -gt 1048576 ]; then
ffmpeg -y -i "$input_file" -vf "scale=iw*0.75:ih*0.75" "${output_file}"
while [ $(stat -f%z "$output_file") -gt 1048576 ]; do
echo "Processing GIF file: $output_file"
# Compress GIF files using ffmpeg
ffmpeg -y -i "$output_file" -vf "scale=iw*0.75:ih*0.75:flags=lanczos,split[s0][s1];[s0]palettegen=max_colors=32[p];[s1][p]paletteuse=dither=bayer" "${output_dir}/tmp-${filename}"
mv "${output_dir}/tmp-${filename}" "${output_file}"
done
mv "${output_file}" "${input_file}"
fi
;;
*)
echo "Skipping file: $input_file"
;;
esac
fi
done
rm -rf ${output_dir}
echo "Compression complete!"