Saving file 'out.webp'
File:      in.png
Dimension: 900 x 600
Output:    29020 bytes Y-U-V-All-PSNR 40.70 44.80 44.99   41.70 dB
           (0.43 bpp)

JPG CVVDP= 9.53 Fsize= 44.2 KB [ cjpeg -baseline -sample 1x1,1x1,1x1 -quality 44 ]

Webp CVVDP= 9.52 Fsize= 28.3 KB [ cwebp -m 6 -af -q 75 ]

JXL CVVDP= 9.52 Fsize= 29.5 KB [ cjxl -e 10 -q 64 ]

AVIF CVVDP= 9.54 Fsize= 16.8 KB [ avifenc -y 420 -d 10 -s 0 -q 47]


WebP compression efficiency relative to [ JXL:  108.2 % ] & [ AVIF: 58.0 % ]