# 安装
sudo pacman -S optipng

# 使用示例
optipng -o5 image.png    # o5 表示优化级别，范围是 0-7
c```

2. **pngquant**
```bash
# 安装
sudo pacman -S pngquant

# 使用示例
pngquant --quality=65-80 image.png  # 设置质量范围在65-80之间

# 安装（从 AUR）
yay -S trimage

# 安装（从 AUR）
yay -S oxipng

# 使用示例
oxipng -o 4 image.png    # o4 表示优化级别，范围是 0-6

$ optipng -o5 10ti5a3.png 
** Processing: 10ti5a3.png
2345x1243 pixels, 4x8 bits/pixel, RGB+alpha
Reducing image to 3x8 bits/pixel, RGB
Input IDAT size = 2715319 bytes
Input file size = 2719369 bytes

Trying:
  zc = 9  zm = 9  zs = 0  f = 1         IDAT size = 2669468
  zc = 9  zm = 8  zs = 0  f = 1         IDAT size = 2664950
  zc = 9  zm = 9  zs = 1  f = 1         IDAT size = 2636506
  zc = 9  zm = 8  zs = 1  f = 1         IDAT size = 2634703
  zc = 9  zm = 9  zs = 0  f = 2         IDAT size = 2460587
  zc = 9  zm = 8  zs = 0  f = 2         IDAT size = 2454191
  zc = 9  zm = 9  zs = 0  f = 4         IDAT size = 2337037
  zc = 9  zm = 8  zs = 0  f = 4         IDAT size = 2332616
  zc = 9  zm = 9  zs = 1  f = 4         IDAT size = 2294549
  zc = 9  zm = 8  zs = 1  f = 4         IDAT size = 2289899
  zc = 9  zm = 9  zs = 3  f = 4         IDAT size = 2279697
                               
Selecting parameters:
  zc = 9  zm = 9  zs = 3  f = 4         IDAT size = 2279697

Output IDAT size = 2279697 bytes (435622 bytes decrease)
Output file size = 2279775 bytes (439594 bytes = 16.17% decrease)

# optipng 会覆盖原始文件，这里仅展示大小对比
$ ls -lha 10ti5a3*
-rw-r--r-- 1 songtianlun songtianlun 2.2M 11月22日 09:46 10ti5a3-c.png
-rw-r--r-- 1 songtianlun songtianlun 2.6M 11月22日 09:46 10ti5a3.png

$ pngquant --quality=65-80 10ti5a3.png
$ ls -lha 10ti5a3*
-rw-r--r-- 1 songtianlun songtianlun 2.2M 11月22日 09:46 10ti5a3-c.png
-rw-r--r-- 1 songtianlun songtianlun 987K 11月22日 09:50 10ti5a3-fs8.png
-rw-r--r-- 1 songtianlun songtianlun 2.6M 11月22日 09:46 10ti5a3.png