JavaScript Image Compress Using HTML5 Canvas and File API Before Upload

https://www.phplift.net/javascript-image-compress-using-html5-canvas-file-api-before-upload/

by huzoorbux • 7 years ago

32 13 7 years ago

phplift.net

mcraiha• 7 years ago

There should be a law that says: "one shall not use var in JavaScript code examples"

yoz-y• 7 years ago

Don't linters complain about it nowadays? Maybe devtools should start doing it too.

accosine• 7 years ago

This can be done in like five lines of Javascript. Why does this even rank on HN?

untog• 7 years ago

What's the minimum number of lines before code becomes notable enough for HN?

ghostbrainalpha• 7 years ago

7 can be acceptable in some cases, but just to be safe I suggest 8 lines.

// 8 Lines not including sarcastic comments obviously.

tmikaeld• 7 years ago

There might not be that many that know about it?

Image-conversion is the library I've used the most, since you can target file-size || quality:

https://github.com/WangYuLue/image-conversion

Piskvorrr• 7 years ago

Database hugged to death :(

Oh wait. It's a redirect to StackOverflow?!

https://stackoverflow.com/questions/23945494/use-html5-to-re...

throwaway_bad2• 7 years ago

Squoosh is a much better demo of how to do in-browser compression (using optipng, mozjpeg, etc): https://github.com/GoogleChromeLabs/squoosh/

There are far more knobs you can tune whereas the native browser conversion only has mimetype and quality (via toBlob: https://developer.mozilla.org/en-US/docs/Web/API/HTMLCanvasE...)

tracker1• 7 years ago

I really like Squoosh... I'm not sure if they have yet, but there was at one time discussion of separating the builds for the underlying wasm built libraries from squoosh whole, which would make it more usable for separate projects.

huzoorbux• 7 years ago

I have used JIC JavaScript Library to perform this task.

https://raw.githubusercontent.com/brunobar79/J-I-C/master/sr...

devwastaken• 7 years ago

browsers need to have an API to access the underlying libraries. No reason I shouldn't be able to use turbojpeg or libpng clientside. Can't even do it in WebAssembly, because simd was an afterthought.

JavaScript Image Compress Using HTML5 Canvas and File API Before Upload

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