JPEG Optimizer 1.0A - PowerShell

# JPEG Optimizer
# Optimizes JPEGs in a folder using Google JPEG optimizer "Guetzli"
# Version: 1.0A

$optimizerTool = 'C:\Users\Dean\Documents\Batch Scripts\Commands\guetzli-x64.exe'

$inputFolder = 'C:\webserver\htdocs\webman1\resources\jpg\avatars'
$outputFolder = 'C:\webserver\htdocs\webman1\resources\jpg\avatars\converted'

# End Edits

if((Test-Path $optimizerTool) -ne $true)
{
    Write-Host 'Please check optimizerTool path is correct: '$optimizerTool -ForegroundColor Red
    exit
}
if((Test-Path $inputFolder) -ne $true)
{
    Write-Host 'Please check inputFolder path is correct: '$inputFolder -ForegroundColor Red
    exit
}
if((Test-Path $outputFolder) -ne $true)
{
    Write-Host 'Please check outputFolder path is correct: '$outputFolder -ForegroundColor Red
    exit
}

$jpegList = Get-ChildItem -Path $inputFolder -Filter '*.jpg'
$numberOfJPEGs =  $jpegList | Measure-Object | ForEach-Object{$_.Count}

Write-Host 'Found'$numberOfJPEGs' images to optimize. Continue?' -ForegroundColor Cyan

pause

Write-Host 'Optimizing JPEG images using guetzli, please wait..' -ForegroundColor Yellow

foreach($file in $jpegList)
{
    #Write-Host 'Optimizing "'$file.Name.'", please wait..' -ForegroundColor Cyan
    Write-Host "Optimizing $file, please wait.." -ForegroundColor Cyan
    $output = '"'+$file.FullName+'" "'+$outputFolder+'\'+$file.Name+'"'
    $arguments = '--quality 99 '+$output
    # $arguments
    $process = Start-Process $optimizerTool -ArgumentList $arguments -PassThru -Wait -NoNewWindow
    $process.WaitForExit()
}

Write-Host 'Optimized JPEG images using guetzli. Please check the output files in: '$outputFolder -ForegroundColor Green