JavaScript Image Compress Using HTML5 Canvas and File API Before Upload

Piskvorrr 6 years ago |

Database hugged to death :(

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

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

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 6 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.

throwaway_bad 6 years ago | | |

Yea I wished it were easier to use out of the box too. The code is fortunately very well organized so you can just copy the pieces you need: https://github.com/GoogleChromeLabs/squoosh/tree/master/src/...

It also does make sense for you to pick and choose only the compression codecs you will need. Otherwise the cost of making every client download huge and unused wasm libraries might outweigh any bandwidth savings from compression.

huzoorbux 6 years ago | |

I have used JIC JavaScript Library to perform this task.

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

accosine 6 years ago |

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

tmikaeld 6 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

untog 6 years ago | |

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

ghostbrainalpha 6 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.

raxor53 6 years ago | | |

These are the new standards, please send out a memo.

devwastaken 6 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.

mcraiha 6 years ago |

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

yoz-y 6 years ago | |

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