Saving file 'out.webp'
File:      in.png
Dimension: 960 x 769
Output:    52942 bytes Y-U-V-All-PSNR 42.31 45.50 45.81   43.16 dB
           (0.57 bpp)

JPG CVVDP= 9.53 Fsize= 64.8 KB [ cjpeg -baseline -sample 1x1,1x1,1x1 -quality 56 ]

Webp CVVDP= 9.53 Fsize= 51.7 KB [ cwebp -m 6 -af -q 81 ]

JXL CVVDP= 9.53 Fsize= 36.5 KB [ cjxl -e 10 -q 70 ]

AVIF CVVDP= 9.55 Fsize= 29.4 KB [ avifenc -y 420 -d 10 -s 0 -q 55]


WebP compression efficiency relative to [ JXL:  46.3 % ] & [ AVIF: 37.0 % ]