Add-Type -AssemblyName PresentationCore,WindowsBase

$path = 'c:\Users\Administrator\Documents\PaaS\photobooth\src\assets\1.png'
$fs = [System.IO.File]::OpenRead($path)
$decoder = [System.Windows.Media.Imaging.BitmapDecoder]::Create(
    $fs,
    [System.Windows.Media.Imaging.BitmapCreateOptions]::None,
    [System.Windows.Media.Imaging.BitmapCacheOption]::OnLoad
)
$frame = $decoder.Frames[0]
$w = $frame.PixelWidth
$h = $frame.PixelHeight
$stride = $w * 4
$bytes = New-Object byte[] ($stride * $h)
$frame.CopyPixels($bytes, $stride, 0)
$fs.Close()

# Check what colors are actually in the second slot area
Write-Host "Sampling SLOT 2 area (Y 600-700, X 80-530):"
for ($y = 600; $y -le 700; $y += 25) {
    $colors = @()
    for ($x = 150; $x -le 450; $x += 50) {
        $i = ($y * $stride) + ($x * 4)
        $b = $bytes[$i]; $g = $bytes[$i + 1]; $r = $bytes[$i + 2]
        $colors += "R=$r"
    }
    Write-Host "Y=$y : $($colors -join ' | ')"
}
