diff --git a/content/posts/image-optimize/index.md b/content/posts/image-optimize/index.md new file mode 100644 index 0000000..c6fb0ae --- /dev/null +++ b/content/posts/image-optimize/index.md @@ -0,0 +1,56 @@ +--- +title: "How to optimize image for websites from the command line" +date: 2023-11-10T22:16:00+00:00 +--- + +When hosting your website with a lot of images, your users need a lot of bandwidth just to load some images, but most of the time the image doesn't need to be that big for the user to load. Here is a guide on how to optimize images for these kind of situations, credits to [Eric Murphy](https://youtu.be/8zj44m0hAoU?si=wAkGlGn5CSWYKR9n). I typed the video in text format as it is such a good video that I want to take notes of that. + +1. Install imagemagick +```sh +sudo pacman -S imagemagick +``` + +# Optimise JPGs + +```sh +convert image.jpg -resize 400x400 image.min.jpg # resize image as you don't always need that big +convert image.jpg -quality 75 image.min.jpg # reduce quality of image, 75% is a good compromise between file size and quality +convert image.jpg -strip image.min.jpg # remove metadata (eg camera details, location, etc.) + +convert image.jpg -sampling-factor 4:2:0 -strip -quality 75 -interlace JPEG -colorspace sRGB -resize 0 converted.jpg # best for web quality wise +``` + +You can make it into a shell script +```sh +#!/bin/sh + +convert $1 -sampling-factor 4:2:0 -strip -quality 75 -interlace JPEG -colorspace sRGB -resize $2 $3 +``` + +# Optimise PNGs + +Mostly same as JPGs + +# Optimise batch of files at a time + +``` +mogrify -sampling-factor 4:2:0 -strip -quality 75 -interlace JPEG -colorspace sRGB -resize 400 -path "opt" *.jpg # converting all jpgs and put all converted jpgs into opt folder +``` + +# Optimise SVGs + +First install svgo with npm + +```sh +npm i -g svgo +``` + +Then run +```sh +svgo logo.svg -o logo.min.svg +``` +# Batch convert SVGs + +```sh +svgo -f ./assets/svgs -o ./assets/optimiszedsvgs # -f specifiying the directory and -o is the output directory +```