Hi, I was wondering if there is any way of converting an image witho

Good question <a class="user-mention notranslate" data-hovercard-type="user" data-hove

Possibility of converting an image to AVIF without losing quality about jsquash HOT 3 CLOSED

patratel commented on July 27, 2024

Possibility of converting an image to AVIF without losing quality

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Comments (3)

jamsinclair commented on July 27, 2024

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

cqLevel: 0
cqAlphaLevel: -1
subsample: 3

That should activate this branch of the code and hopefully give you lossless conversion 🤞

jSquash/packages/avif/codec/enc/avif_enc.cpp

Lines 61 to 63 in f662d8c

 bool lossless = options.cqLevel == AVIF_QUANTIZER_LOSSLESS && 

 options.cqAlphaLevel <= AVIF_QUANTIZER_LOSSLESS && 

 format == AVIF_PIXEL_FORMAT_YUV444;

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patratel commented on July 27, 2024

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

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jamsinclair commented on July 27, 2024

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

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Possibility of converting an image to AVIF without losing quality about jsquash HOT 3 CLOSED

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	bool lossless = options.cqLevel == AVIF_QUANTIZER_LOSSLESS &&
	options.cqAlphaLevel <= AVIF_QUANTIZER_LOSSLESS &&
	format == AVIF_PIXEL_FORMAT_YUV444;