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http://git.nowherejezfoltodf4jiyl6r56jnzintap5vyjlia7fkirfsnfizflqd.onion/nihilist/blog-contributions.git
synced 2025-07-02 11:56:40 +00:00
43 lines
1.3 KiB
Bash
43 lines
1.3 KiB
Bash
#!/bin/bash
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# Run before executing:
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# sudo apt install webp parallel
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# Script will compress all images in directory given in the first parameter.
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# JPEGs are lossy compressed, PNGs are losslessly compressed
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# $ ./imagecompress.sh # current directory
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# $ ./imagecompress.sh opsec/ # specified directory
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# Already compressed WebP image will be kept, it only cares about image/png and image/jpeg mime.
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# Compression commands are run in parallel using all available cores but it can take some time at first.
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# WARNING:
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# cwebp by default removes all EXIF, XMP and ICC tags.
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# Images rotated only through Exif tag can have wrong orientation after compression.
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# However we shouldn't have too much Exif here anyways.
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DIR="${1:-$(pwd)}"
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calculate_size() {
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du -sh --exclude='.git' "$1" | awk '{print $1}'
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}
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initial_size=$(calculate_size "$DIR")
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echo "Updating JPEGs"
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# Lossy compression for JPEGs
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find "$DIR" -print0 | parallel -0 '
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[[ $(file --mime-type -b "{}") == "image/jpeg" ]] &&
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cwebp "{}" -q 65 -m 6 -o "{}"
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'
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echo "Updating PNGs"
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# Lossless compression for PNGs
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find "$DIR" -print0 | parallel -0 '
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[[ $(file --mime-type -b "{}") == "image/png" ]] &&
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cwebp "{}" -q 100 -m 6 -lossless -o "{}"
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'
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final_size=$(calculate_size "$DIR")
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echo "Compressed $initial_size -> $final_size"
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