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jamsinclair / jSquash

Browser & Web Worker focussed image codec wasm bundles derived from the Squoosh App.
Apache License 2.0
250 stars 19 forks source link

Possibility of converting an image to AVIF without losing quality #29

Closed patratel closed 1 year ago

patratel commented 1 year ago

Hi,

I was wondering if there is any way of converting an image without losing quality. I've tried tweaking with the encode options to no avail(mostly the cqLevel). It's mostly visible when i convert low rez images, and less so when using high rez images. These are the current options I'm now using

cqLevel: 10, cqAlphaLevel: -1, denoiseLevel: 0, tileColsLog2: 0, tileRowsLog2: 0, speed: 6, subsample: 1, chromaDeltaQ: false, sharpness: 0,

jamsinclair commented 1 year ago

Good question @patratel . Sounds like you want lossless encoding. Your settings look like they're almost there.

Based on the Squoosh code – you'll need the following values to trigger lossless mode

That should activate this branch of the code and hopefully give you lossless conversion 🤞 https://github.com/jamsinclair/jSquash/blob/f662d8c9e1599129fd2108cbe22aff7a713958fb/packages/avif/codec/enc/avif_enc.cpp#L61-L63

patratel commented 1 year ago

Hey thank you for your answer. This did the trick!

jamsinclair commented 1 year ago

Great to hear! I'll mark this as resolved and close then 👍