replace png images in all subfolders by webp

png_to_web.ps1

# install cwebp from: https://developers.google.com/speed/webp/docs/precompiled, and add it to $env:PATH

# 1- Conver png to web
(Get-ChildItem . -Recurse -File) | ForEach-Object { $src = "$($_.DirectoryName)\$($_.Name)"; if ($src.EndsWith(".png")) { $dst = $src.Replace(".png", ".webp"); cwebp -q 60 -o $dst $_; } }
# 2- Cleanup converted png files
(Get-ChildItem . -Recurse -File) | ForEach-Object { $src = "$($_.DirectoryName)\$($_.Name)"; if ($src.EndsWith(".png")) { Remove-Item $_ } }