https://github.com/tableflip/resize-jpeg
:rainbow: Resize your jpeg and preserve it's original quality
https://github.com/tableflip/resize-jpeg
Last synced: about 1 year ago
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:rainbow: Resize your jpeg and preserve it's original quality
- Host: GitHub
- URL: https://github.com/tableflip/resize-jpeg
- Owner: tableflip
- License: isc
- Created: 2015-07-06T13:02:05.000Z (almost 11 years ago)
- Default Branch: master
- Last Pushed: 2015-08-09T08:28:00.000Z (almost 11 years ago)
- Last Synced: 2025-02-15T12:46:46.806Z (over 1 year ago)
- Language: JavaScript
- Homepage:
- Size: 137 KB
- Stars: 2
- Watchers: 5
- Forks: 0
- Open Issues: 0
-
Metadata Files:
- Readme: README.md
- License: LICENSE
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README
# resize-jpeg
You want to resize a jpeg? You want to preserve it's visual quality while doing so?
```sh
resize-jpeg -w 800 original.jpg > original.w800.jpg
```
## Resize a jpeg and optimise for the web with `mozjpeg`
[GraphicsMagick](http://www.graphicsmagick.org/) (and ImageMagick) dial down the quality of your JPEG files when you resize them.
That's surprising. [`mozjpeg`](https://npm.io/mozjpeg) does a better job of optimising pixels for your eyes, and every byte counts, so instead:
```sh
resize-jpeg --minify -w 800 original.jpg > original.w800.min.jpg
```
That'll generally give a better output jpeg for fewer bytes. Win win!
## Get started
Use a sensible package manager for you OS to install http://www.graphicsmagick.org/
Then use npm to install `resize-jpeg`, globally as a command line tool.
```sh
brew install graphicsmagick
npm install -g resize-jpeg
resize-jpeg -w 800 path/to/my/picture
```
where `-w` is the new **width** you'd like proportionally scale the image to.
Add a `--minify` in there to engage mozjpeg minification magic.
## Use it as a module!
Add it to your project
`npm install --save resize-jpeg`
Add you now have a transform stream that'll resize internet pugs on the fly:
```js
var fs = require('fs')
var http = require('http')
var resizeJpeg = require('resize-jpeg')
http.get('http://aboutpug.com/wp-content/uploads/2015/01/flying-monkey-cute-pug.jpg')
.on('response', function (resp) {
resp
.pipe(resizeJpeg(800))
.pipe(fs.createWriteStream('webpug.w800.jpg'))
})
```
or more simply, just resize jpegs from your local file system
```js
var fs = require('fs')
var http = require('http')
var resizeJpeg = require('resize-jpeg')
fs.createReadStream('flying-pug.jpg')
.pipe(resizeJpeg(800))
.pipe(fs.createWriteStream('pug.w800.jpg'))
```
## How does it work?
Under the hood, `resize-jpeg` is just doing the work of remembering the nasty gm command arguments for you. If you prefer to do it long hand, then it's the same as:
```sh
gm convert original.jpg -resize 800x800 -define jpeg:preserve-settings - > original.w800.min.jpg
```
---
A [(╯°□°）╯︵TABLEFLIP](https://tableflip.io) side project.