Sam Hadow
94 lines
1.9 KiB
Bash
Executable File
94 lines
1.9 KiB
Bash
Executable File
#!/bin/bash
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input="$1"
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output="$2"
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target_size_raw="$3"
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if [[ -z "$input" || -z "$output" || -z "$target_size_raw" ]]; then
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echo "Usage: $0 input output.jpg <target size>"
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exit 1
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fi
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parse_size() {
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local size="$1"
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size=$(echo "$size" | tr '[:lower:]' '[:upper:]' | tr -d ' ')
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if [[ "$size" =~ ^([0-9]+(\.[0-9]+)?)(B|KB|MB)?$ ]]; then
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value="${BASH_REMATCH[1]}"
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unit="${BASH_REMATCH[3]}"
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case "$unit" in
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""|"B") multiplier=1 ;;
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"KB") multiplier=1024 ;;
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"MB") multiplier=$((1024 * 1024)) ;;
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*) echo "Invalid size unit: $unit"; exit 1 ;;
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esac
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awk "BEGIN {printf \"%d\", $value * $multiplier}"
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else
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echo "Invalid size format: $size"
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exit 1
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fi
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}
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target_size=$(parse_size "$target_size_raw")
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compress_and_get_size() {
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local q=$1
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magick "$work" -strip -interlace Plane -quality "$q" "$output"
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stat -c%s "$output"
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}
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work=$(mktemp --suffix=.jpg)
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cp "$input" "$work"
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magick "$input" \
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-auto-orient \
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-colorspace sRGB \
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-strip \
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-background white -alpha remove -alpha off \
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"$work"
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echo "Trying to fit below $target_size bytes"
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while true; do
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# Binary search
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low=1
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high=95
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best_q=1
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while (( low <= high )); do
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mid=$(((low + high) / 2))
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size=$(compress_and_get_size "$mid")
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echo " Quality $mid -> $size bytes"
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best_size=$size
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if (( size <= target_size )); then
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best_q=$mid
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low=$((mid + 1))
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else
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high=$((mid - 1))
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fi
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done
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echo "Best quality this round: $best_q ($best_size bytes)"
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if (( best_size <= target_size )); then
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echo "DONE: $output is $best_size bytes"
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break
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fi
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echo " Reducing resolution"
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tmp=$(mktemp --suffix=.jpg)
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magick "$work" -resize 75% -quality 85 "$tmp"
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mv "$tmp" "$work"
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done
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rm -f "$work"
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