Comment 3 for bug 1946567

AVIF is indeed having a major influence, and it does provide better image quality than JPEG for the same or better compression (for this reason, Netflix uses it on supported devices). AVIF helps to reduce bandwidth on websites. It supports both lossy and lossless.

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More information:

• You can convert images free of charge using https://avif.io/ (the work is done on your computer; nothing is sent over the internet).

• GIMP in Flatpak supports AVIF, but not GIMP in snap. The snap version should be included in this fix.

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Temporary workaround:

As a temporary workaround, you can add AVIF support to Image Viewer, Nautilus, the Desktop, and Ubuntu in general with the following:

sudo add-apt-repository ppa:ubuntuhandbook1/apps
sudo apt update
sudo apt upgrade

Source: https://www.omgubuntu.co.uk/2021/09/thumb-3-12-avif-heif-image-support

However, AVIF should be built into Ubuntu instead of relying on a third-party repository.