https://bugs.kde.org/show_bug.cgi?id=474862
--- Comment #7 from John <kdelo...@mozej.com> ---
Not really. I did it on purpose not to reaveal anything for blind test. One is
(among other parameters) "max/slowest" (see "s" parameter) and the other is one
step above the default (after me checking gain vs speed curve chart in
documentation). Both are different implementations.
One implementation when it comes to "tiles" (my experiments), might behave
better than the other (it sees "the tiles" which I created in gimp manipulating
a photo. It doesnt change within the tile, but "from title to tile" <--- larger
identical surface). The other is also very good with newer versions, but "max"
("s") is slow as hell. Some gain would be there in size, but the trade-off vs
speed is huge. You have to have NASA supercomputer speed (curve goes up a lot).
Another optimisations are advanced quantitisations mode turn off (if it works,
not applicable for loosless, loseless is not great here, besides if you zoom
those pngs to pixels there's like zero difference, so q-100 makes no sense). In
other places some color profile is broken non-standard, some color profiles are
very bad to compress, always full range search, 444 colors, instead of 422,
enabled chroma in delta planes, and in one version its tuned not with psnr, but
with better ssim, sharp color transitions and bias towards sharpness. In other
I let great internals to work.
P.S. cjxl for photos with jpg is by default loseless, (revereable). There were
a few .jpgs in the wallpaper folder.
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