Saving file 'out.webp'
File:      in.png
Dimension: 1024 x 768
Output:    30454 bytes Y-U-V-All-PSNR 34.57 39.26 40.38   35.72 dB
           (0.31 bpp)

JPG CVVDP= 8.98 Fsize= 54.7 KB [ cjpeg -baseline -sample 1x1,1x1,1x1 -quality 22 ]

Webp CVVDP= 8.98 Fsize= 29.7 KB [ cwebp -m 6 -af -q 26 ]

JXL CVVDP= 8.97 Fsize= 34.0 KB [ cjxl -e 10 -q 34 ]

AVIF CVVDP= 8.98 Fsize= 19.4 KB [ avifenc -y 420 -d 10 -s 0 -q 34]


WebP compression efficiency relative to [ JXL:  120.8 % ] & [ AVIF: 70.8 % ]