CompressImages.ps1

Function Compress-Images() {
    if(!(Test-Path -Path "Compressed")) {
        New-Item -ItemType Directory -Force -Path "Compressed"
    }

    if((Get-Command "guetzli_windows_x86-64.exe" -ErrorAction SilentlyContinue) -eq $null) {
        Write-Host "Could not find guetzli_windows_x86-64.exe in path."
    }

    $files = Get-ChildItem -Filter *.jpg
    foreach($file in $files) {
        $name = $file.Name
        Write-Host "Compressing $($name)"

        guetzli_windows_x86-64.exe --quality 84 "$($name)" "Compressed/$($name)"
    }
}