Saving file 'out.webp'
File:      in.png
Dimension: 1024 x 768
Output:    99510 bytes Y-U-V-All-PSNR 36.50 41.69 45.75   37.83 dB
           (1.01 bpp)

JPG CVVDP= 9.53 Fsize= 116.5 KB [ cjpeg -baseline -sample 1x1,1x1,1x1 -quality 57 ]

Webp CVVDP= 9.53 Fsize= 97.2 KB [ cwebp -m 6 -af -q 71 ]

JXL CVVDP= 9.54 Fsize= 98.8 KB [ cjxl -e 10 -q 76 ]

AVIF CVVDP= 9.55 Fsize= 72.8 KB [ avifenc -y 420 -d 10 -s 0 -q 55]


WebP compression efficiency relative to [ JXL:  109.0 % ] & [ AVIF: 44.2 % ]