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summitwave_landing/optimize_device_img.sh
2025-08-25 13:28:25 +02:00

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#!/usr/bin/env bash
set -euo pipefail
orig="src/img/device.png"
backup="src/img/device@orig.png"
if [[ ! -f "$orig" ]]; then
echo "Error: $orig not found" >&2
exit 1
fi
# Backup original once
if [[ ! -f "$backup" ]]; then
cp "$orig" "$backup"
echo "Backup created at $backup"
else
echo "Backup already exists at $backup"
fi
before_size=$(stat -c%s "$orig" 2>/dev/null || wc -c < "$orig")
opt_tool=""
if command -v pngquant >/dev/null 2>&1; then
opt_tool="pngquant"
# Use pngquant lossy compression with reasonable quality range
pngquant --skip-if-larger --force --quality=65-80 --output "$orig" "$backup"
elif command -v oxipng >/dev/null 2>&1; then
opt_tool="oxipng"
# Lossless optimization
oxipng -o 4 --strip safe -i 0 -Z "$orig"
elif command -v convert >/dev/null 2>&1; then
opt_tool="imagemagick"
# Resize to max width 1200px (keeps aspect), strip metadata; re-encode PNG
convert "$orig" -strip -resize 1200x -define png:compression-level=9 -define png:compression-filter=5 -define png:compression-strategy=1 "$orig.tmp"
mv -f "$orig.tmp" "$orig"
else
echo "No optimizer found (pngquant/oxipng/ImageMagick). Install one and re-run." >&2
exit 2
fi
after_size=$(stat -c%s "$orig" 2>/dev/null || wc -c < "$orig")
fmt() { num=$1; awk -v n=$num 'BEGIN{ split("B KB MB GB TB",u); s=1; while (n>=1024 && s<5){n/=1024; s++} printf "%.2f %s", n, u[s] }'; }
echo "Optimizer used: $opt_tool"
echo "Before: $(fmt $before_size)"
echo "After: $(fmt $after_size)"
if (( after_size < before_size )); then
echo "✅ device.png optimized successfully."
else
echo " No size improvement (tool limitations or already optimized)."
fi