引数で受け取ったパスの画像を水平反転させるPowerShellのコード

flipImage.ps1

Param(
    [parameter(mandatory=$true)][String]$imageUrl
)

Add-Type -AssemblyName System.Drawing
$stream = [System.IO.FileStream]::new(
                $imageUrl,
                [System.IO.FileMode]::Open,
                [System.IO.FileAccess]::ReadWrite)
$srcImage = [System.Drawing.Image]::FromStream($stream)
$stream.Dispose()
$srcImage.RotateFlip("Rotate180FlipY")
$srcImage.Save($imageUrl, [System.Drawing.Imaging.ImageFormat]::Png)
$srcImage.Dispose()