Script which can be used to optimize images. All you need to do is download the script and call it. The script will download the files it needs to run.

get-image-optimizer.ps1

function OptimizeImages{
    [cmdletbinding()]
    param(
        $folder,
        $force = $false,
        $customTemp = "$env:LocalAppData\CustomPublish\",
        $imgOptUrl = 'https://raw.githubusercontent.com/ligershark/AzureJobs/master/ImageCompressor.Job/optimize-images.ps1'
        )
    process{
        if(!(Test-Path $customTemp)){New-Item $customTemp -ItemType Directory}
        
        $imgOptPath = (Join-Path $customTemp 'optimize-images.ps1')
        if(!(Test-Path $imgOptPath)){
            # download the file
            'Downloading optimize-images.ps1' | Write-Verbose
            (New-Object System.Net.WebClient).DownloadFile($imgOptUrl, $imgOptPath)
        }

        &$imgOptPath $folder $force
    }
}

$customTemp = "$env:LocalAppData\CustomPublish\"
$imgOptPath = Join-Path $customTemp 'optimize-images.ps1'
$imgOptUrl = 'https://raw.githubusercontent.com/ligershark/AzureJobs/master/ImageCompressor.Job/optimize-images.ps1'

optimize-images.ps1

[cmdletbinding()]
param(
    $folderToOptimize = ($pwd),
    [switch]
    $force = $false,

    $toolsDir = ("$env:LOCALAPPDATA\LigerShark\tools\"),

    $nugetDownloadUrl = 'http://nuget.org/nuget.exe'
)

<#
.SYNOPSIS
    If nuget is in the tools
    folder then it will be downloaded there.
#>
function Get-Nuget(){
    [cmdletbinding()]
    param(
        $toolsDir = ("$env:LOCALAPPDATA\LigerShark\tools\"),

        $nugetDownloadUrl = 'http://nuget.org/nuget.exe'
    )
    process{
        $nugetDestPath = Join-Path -Path $toolsDir -ChildPath nuget.exe
        
        if(!(Test-Path $nugetDestPath)){
            'Downloading nuget.exe' | Write-Verbose
            (New-Object System.Net.WebClient).DownloadFile($nugetDownloadUrl, $nugetDestPath)

            # double check that is was written to disk
            if(!(Test-Path $nugetDestPath)){
                throw 'unable to download nuget'
            }
        }

        # return the path of the file
        $nugetDestPath
    }
}

<#
.SYNOPSIS
    If the image optimizer in the .ools
    folder then it will be downloaded there.
#>
function GetImageOptimizer(){
    [cmdletbinding()]
    param(
        $toolsDir = ("$env:LOCALAPPDATA\LigerShark\tools\"),
        $nugetDownloadUrl = 'http://nuget.org/nuget.exe'
    )
    process{
        
        if(!(Test-Path $toolsDir)){
            New-Item $toolsDir -ItemType Directory | Out-Null
        }

        $imgOptimizer = (Get-ChildItem -Path $toolsDir -Include 'ImageCompressor.Job.exe' -Recurse)

        if(!$imgOptimizer){
            'Downloading image optimizer to the .tools folder' | Write-Verbose
            # nuget install AzureImageOptimizer -Prerelease -OutputDirectory C:\temp\nuget\out\
            $cmdArgs = @('install','AzureImageOptimizer','-Prerelease','-OutputDirectory',(Resolve-Path $toolsDir).ToString())

            'Calling nuget to install image optimzer with the following args. [{0}]' -f ($cmdArgs -join ' ') | Write-Verbose
            &(Get-Nuget -toolsDir $toolsDir -nugetDownloadUrl $nugetDownloadUrl) $cmdArgs | Out-Null
        }

        $imgOptimizer = Get-ChildItem -Path $toolsDir -Include 'ImageCompressor.Job.exe' -Recurse | select -first 1
        if(!$imgOptimizer){ throw 'Image optimizer not found' }       

        $imgOptimizer
    }
}

function OptimizeImages(){
    [cmdletbinding()]
    param(
        [Parameter(Mandatory=$true,Position=0)]
        $dir,
        $toolsDir = ("$env:LOCALAPPDATA\LigerShark\tools\"),
        $nugetDownloadUrl = 'http://nuget.org/nuget.exe'
    )
    process{        
        [string]$imgOptExe = (GetImageOptimizer -toolsDir $toolsDir -nugetDownloadUrl $nugetDownloadUrl)

        [string]$folderToOptimize = (Resolve-path $dir)

        'Starting image optimizer on folder [{0}]' -f $dir | Write-Output
        # .\.tools\AzureImageOptimizer.0.0.10-beta\tools\ImageCompressor.Job.exe --dir M:\temp\images\opt\to-optimize
        $cmdArgs = @('--dir', ('{0}\' -f (get-item $folderToOptimize).FullName))
        if($force){
            $cmdArgs += '--force'
        }

        'Calling img optimizer with the following args [{0} {1}]' -f $imgOptExe, ($cmdArgs -join ' ') | Write-Output
        &$imgOptExe $cmdArgs

        'Images optimized' | Write-Output
    }
}

OptimizeImages -dir $folderToOptimize -toolsDir $toolsDir -nugetDownloadUrl $nugetDownloadUrl