Saving file 'out.webp'
File:      in.png
Dimension: 1024 x 768
Output:    64086 bytes Y-U-V-All-PSNR 39.64 42.79 43.87   40.55 dB
           (0.65 bpp)

JPG CVVDP= 9.53 Fsize= 84.7 KB [ cjpeg -baseline -sample 1x1,1x1,1x1 -quality 49 ]

Webp CVVDP= 9.53 Fsize= 62.6 KB [ cwebp -m 6 -af -q 76 ]

JXL CVVDP= 9.53 Fsize= 62.7 KB [ cjxl -e 10 -q 70 ]

AVIF CVVDP= 9.55 Fsize= 39.0 KB [ avifenc -y 420 -d 10 -s 0 -q 52]


WebP compression efficiency relative to [ JXL:  100.5 % ] & [ AVIF: 48.4 % ]