Create image thumbnails with Power Shell

Create-Thumbnails.ps1

Param (
    [Parameter(Mandatory=$True)]
    [string] $Type,

    [Parameter(Mandatory=$True)]
    [string] $Width,

    [Parameter(Mandatory=$True)]
    [string] $Height
)

[void][reflection.assembly]::LoadWithPartialName("System.Windows.Forms")

Get-ChildItem *.$Type | ForEach {

    $fullPath  = $(Resolve-Path $_).ToString()
    $fullPath  = $fullPath.Substring(0, $fullPath.LastIndexOf('.'));
    $imageFile = "$($fullPath).$($Type)"
    $thumbFile = "$($fullPath)_thumb.$($Type)"

    if (! $imageFile) { "File '$imageFile' not found, exiting."; exit }
    Write-Host $imageFile;

    $image = [System.Drawing.Image]::FromFile($imageFile, $true);
    $thumb = $image.GetThumbnailImage($Width, $Height, $null, [intptr]::Zero);
    $thumb.Save($thumbFile);
    $thumb.Dispose();
    $image.Dispose();

    Write-Host $thumbFile;
    Write-Host

}