القائمة
Optimize PNG and JPEG images locally using pngquant and mozjpeg/jpegtran — TinyPNG-level compression without API keys.
التثبيت باستخدام Codex أو Claude انسخ هذا Prompt والصقه في Codex أو Claude أو مساعد آخر ليراجع صفحة Skill ويثبّتها لك.
استنادا إلى تصنيف SOC المهني
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| name | image-optimize |
| description | Optimize PNG and JPEG images locally using pngquant and mozjpeg/jpegtran — TinyPNG-level compression without API keys. |
| version | 1.0.0 |
Compress PNG and JPEG images locally. Achieves 60–80% size reduction with no visible quality loss.
brew install pngquant mozjpeg
Verify:
pngquant --version # 3.0.3+
/opt/homebrew/opt/mozjpeg/bin/jpegtran -version
# Single file, overwrite in place
pngquant --quality=75-90 --speed=1 --force --output image.png image.png
# All PNGs in a directory
for f in /path/to/dir/*.png; do
before=$(stat -f%z "$f")
pngquant --quality=75-90 --speed=1 --force --output "$f" "$f"
after=$(stat -f%z "$f")
pct=$(( (before - after) * 100 / before ))
echo "$f: $(( before/1024 ))KB → $(( after/1024 ))KB (-${pct}%)"
done
| Use case | --quality |
|---|---|
| Blog covers, hero images | 75-90 |
| Product/portfolio (high quality) | 85-95 |
| Thumbnails, icons | 65-80 |
JPEGTRAN=/opt/homebrew/opt/mozjpeg/bin/jpegtran
# Single file
$JPEGTRAN -copy none -optimize -progressive -outfile output.jpg input.jpg
# All JPEGs in a directory, overwrite in place
for f in /path/to/dir/*.jpg /path/to/dir/*.jpeg; do
[ -f "$f" ] || continue
before=$(stat -f%z "$f")
$JPEGTRAN -copy none -optimize -progressive -outfile "$f.tmp" "$f" && mv "$f.tmp" "$f"
after=$(stat -f%z "$f")
pct=$(( (before - after) * 100 / before ))
echo "$f: $(( before/1024 ))KB → $(( after/1024 ))KB (-${pct}%)"
done
#!/bin/bash
# Usage: optimize-images.sh /path/to/dir
DIR="${1:-.}"
JPEGTRAN=/opt/homebrew/opt/mozjpeg/bin/jpegtran
total_before=0; total_after=0
for f in "$DIR"/*.png "$DIR"/*.PNG; do
[ -f "$f" ] || continue
before=$(stat -f%z "$f")
pngquant --quality=75-90 --speed=1 --force --output "$f" "$f"
after=$(stat -f%z "$f")
total_before=$((total_before + before))
total_after=$((total_after + after))
echo "PNG $f: $(( before/1024 ))KB → $(( after/1024 ))KB (-$(( (before-after)*100/before ))%)"
done
for f in "$DIR"/*.jpg "$DIR"/*.jpeg "$DIR"/*.JPG "$DIR"/*.JPEG; do
[ -f "$f" ] || continue
before=$(stat -f%z "$f")
$JPEGTRAN -copy none -optimize -progressive -outfile "$f.tmp" "$f" && mv "$f.tmp" "$f"
after=$(stat -f%z "$f")
total_before=$((total_before + before))
total_after=$((total_after + after))
echo "JPEG $f: $(( before/1024 ))KB → $(( after/1024 ))KB (-$(( (before-after)*100/before ))%)"
done
if [ $total_before -gt 0 ]; then
echo ""
echo "Total: $(( total_before/1024 ))KB → $(( total_after/1024 ))KB (-$(( (total_before-total_after)*100/total_before ))%)"
fi
| Format | Average reduction |
|---|---|
| PNG (pngquant lossy) | 60–75% |
| JPEG (jpegtran lossless) | 5–20% |
| JPEG (cjpeg lossy) | 30–60% |
--output equals input — use --force flag.stat -f%z gives file size in bytes (Linux uses stat -c%s).