webp and avif profile use flags

[Goverp]

While trying to find space-efficient scanned-image compression, I came across webp and avif, which IIUC will be the next great things, the first because Google says so, and the second because it's fully open source. So I was surprised that my setup didn't already include support, as neither use flag appears to be in the desktop profile. I appreciate this is both a technical impact to change a profile, and a "political" decision over what should be defaults.

FWIW I changed my make.conf USE flags (I know the new improved way is "*/* foo" in package.use, but old habits die hard, and anyway make.conf describes my system setup, so that seems a good home), and not too much recompilation.
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Greybeard

[Zucca]

avif is the image format based on av1 video codec, IIRC.

Out of interest, have you tried jpegxl?
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[Goverp]

Zucca, thanks for the pointer to jpegxl - I'd missed that. More recompilations...

As a KDE user, it appears I also need to install dev-qt/qtimageformats to get webp support in Skanpage. It seems to be optional.

A bit of testing on scanned printed letters from my bank shows that webp and avif files are about 60-70% of the size of the jpeg for the same dpi, and slightly subjectively clearer - sharper edges to the characters. Sadly, when I used tesseract to convert the webp pages to a pdf, the images got converted to standard jpeg - I guess that's inevitable. I'll see if jpegxl changes that.
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Greybeard

[Goverp]

OK, some sizes. I'm not impressed by jpeg-xl. Looks like something in Skanpage or kimageformats is suboptimal. (Now we know why it's "XL" - extra large )
This is an A4 300dpi colour scan, mostly black & white, a logo, some QR codes, the rest text, some in reverse video:

[szatox]

Webp is already widely used on the internet, so yes, it does have a pretty good chance to be the jpg killer.
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