Npm image compress

chatgpt
imagemin本身是一個影像壓縮的「框架」，但不包含實際的壓縮功能。要使用 imagemin 來壓縮特定格式的圖片，必須額外安裝相應的插件

sharp與imagemin針對不同圖片的優化能力不一，沒有一定哪個比較好。速度上也無明顯的差別差別。
https://tiffrrr.medium.com/webpack-webpack-imagemin%E5%A3%93%E7%B8%AE%E5%9C%96%E7%89%87-768928718807

plugin的選用與測試：
在npm上可以查到能用的plugin有非常多，例如。

無損壓縮：
JPEG: imagemin-jpegtran
PNG：imagemin-optipng

有損壓縮：
JPEG: imagemin-mozjpeg
PNG: imagemin-pngquant

imagemin，它是一款可以集成多个压缩库的工具，支持jpg，png，webp等等格式的图片压缩，比如pngquant，mozjpeg等等

Sharp vs Imagemin for Image Minification in Node.js
https://blockqueue.io/blog/2024-09-22-sharp-vs-imagemin-comparison
3mb.jpg Time Taken (Sharp) 6.38s; Imagemin 9.31s

sharp
Resizing an image is typically 4x-5x faster than using the quickest ImageMagick and GraphicsMagick settings due to its use of libvips.
https://www.npmjs.com/package/sharp
https://www.npmjs.com/package/sharp-cli

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CLI

https://www.githubcompare.com/tjko/jpegoptim+kud/jpegrescan+mozilla/mozjpeg

jpegoptim vs jpegtran vs mozjpeg
https://stackoverflow.com/questions/36046782/jpegoptim-vs-jpegtran-vs-mozjpeg

# [python脚本使用mozjpeg批量压缩图片](https://www.cnblogs.com/ZerlinM/p/18615026 "发布于 2024-12-18 15:12")

安装mozjpeg

    npm install mozjpeg -g

Windows

https://github.com/XhmikosR/jpegoptim-windows
2023

https://mozjpeg.codelove.de/binaries.html
2022

scoop install main/jpegoptim

Caesium Image Compressor
https://saerasoft.com/caesium
https://github.com/Lymphatus/caesium-clt
npm …
pngquant is a command-line utility and a library for lossy compression of PNG images.
https://pngquant.org/

mozjpeg

jpegtran optimize without changing filename
jpegtran -copy none -optimize -outfile image.jpg image.jpg
https://stackoverflow.com/questions/5579183/jpegtran-optimize-without-changing-filename

Q: Same output and input
No, cjpeg doesn’t support that.
https://github.com/mozilla/mozjpeg/issues/248

Q: Using jpegtran and mozjpeg together give some confusing
There is no mozjpeg command. This project ships cjpeg and jpegtran. Are you using a 3rd party tool that wraps them or renames them?
https://github.com/mozilla/mozjpeg/issues/229

mozjpeg/usage.txt
https://github.com/mozilla/mozjpeg/blob/master/usage.txt

$ cjpeg -quality 80 foo.bmp > bar.jpg
https://hacks.mozilla.org/2014/08/using-mozjpeg-to-create-efficient-jpegs/

webp

original files: 153MB

subprocess.run(["jpegoptim", "--strip-all", "--max=85", file_path])

63.6MB

subprocess.run(["jpegtran", "-optimize", "-progressive", "-copy", "none", "-outfile", file_path, file_path])

install mozjpeg from scoop
file size: 66.6MB

from PIL import Image               # import the PIL.Image module
img = Image.open("image.webp")      # open your image
img.save("image2.webp", quality=70) # save the image with the given quality

37.7MB
https://wenchen1997.com/blog/python/images-to-webp
https://wenchen1997.com/blog/webp-test
https://stackoverflow.com/questions/63225613/is-there-a-way-to-set-image-quality-for-webp-images-in-python