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Add-Type -A System.Drawing
# function to get pixel color from main application window
function Get-PixelColorFromAppWindow {
    [cmdletbinding()]
    param(
        [Parameter(mandatory=$true,ValueFromPipelineByPropertyName=$true)][Alias('Name')][string]$application,  
        [Parameter(mandatory=$true)][System.Drawing.Point]$point
    )
    begin{
        $ErrorActionPreference = 'Stop'  
        if (!('w32.tools' -as [type])){  
            Add-Type -Namespace w32 -Name tools -ReferencedAssemblies 'System.Drawing' –MemberDefinition '  
                [StructLayout(LayoutKind.Sequential)]
                public struct RECT
                {
                    public int left;
                    public int top;
                    public int right;
                    public int bottom;
                }
                [StructLayout(LayoutKind.Sequential)]
                public struct WINDOWPLACEMENT
                {
                    public int length;
                    public int flags;
                    public int showCmd;
                    public System.Drawing.Point ptMinPosition;
                    public System.Drawing.Point ptMaxPosition;
                    public RECT rcNormalPosition;
                    public RECT rcDevice;
                }
                [DllImport("user32.dll")] public static extern bool SetForegroundWindow (IntPtr hWnd);  
                [DllImport("user32.dll")] public static extern IntPtr GetForegroundWindow ();  
                [DllImport("user32.dll")] public static extern bool ShowWindow(IntPtr hWnd, int nCmdShow);  
                [DllImport("user32.dll")] public static extern bool GetWindowRect(IntPtr hWnd, out RECT lpRect);  
                [DllImport("user32.dll")] public static extern bool GetWindowPlacement(IntPtr hWnd, out WINDOWPLACEMENT lpwndpl);  
            '  
        }
        $img = [System.Drawing.Bitmap]::new(1,1)
    }
    process{
        try{
            # try get application process
            $app = Get-Process -Name ([IO.Path]::GetFileNameWithoutExtension($application)) -EA Stop | ? MainWindowhandle -ne 0 | select -F 1
            # get main window handle
            $winhandle = $app.MainWindowHandle
            if(!$winhandle){
                throw "No main window handle found for process '$application'."  
                return
            }
            # get current top window and state (to restore it's state) 
            $orig_tophandle = [W32.Tools]::GetForegroundWindow()
            $orig_state = New-Object w32.tools+WINDOWPLACEMENT
            [void][W32.Tools]::GetWindowPlacement($winhandle,[ref]$orig_state)

            # set applications window on top
            [void][W32.Tools]::ShowWindow($winhandle,9)
            [void][W32.Tools]::SetForegroundWindow($winhandle)
            sleep -Milliseconds 50
    
            # get window position on screen 
            $winpos = New-Object w32.tools+RECT
            [void][W32.Tools]::GetWindowRect($winhandle,[ref]$winpos)
            # copy desired pixel of window to image
            [System.Drawing.Graphics]::FromImage($img).CopyFromScreen($winpos.left+$point.X,$winpos.top+$point.Y,0,0,[System.Drawing.Size]::new(1,1))
            $pixel = $img.GetPixel(0,0)
            # restore top window and state of app
            if ($orig_tophandle -ne [System.IntPtr]::Zero){
                [void][W32.Tools]::SetForegroundWindow($orig_tophandle)
            }
            if ($orig_state.showCmd){
                [void][W32.Tools]::ShowWindow($winhandle,$orig_state.showCmd)
            }
            return $pixel | select @{n='Application';e={$application}},*  
        }catch{
            Write-Error -Message $_.Exception.Message
        }finally{
            if ($img){$img.Dispose()}
        }
    }
}
# define process of window
$app = 'cmd.exe'  
# define pixel coordinates (x,y) inside applications main window (coords are relative to windows top left corner)
$app_coordinates = '200,200'  
# get color from application window at defined position
$color = Get-PixelColorFromAppWindow $app -point $app_coordinates
# check if color meets the requirements (this example matches the color to be at most red)
if ($color.R -gt 200 -and $color.G -lt 100 -and $color.B -lt 100){
    write-host "Red color detected at Pixel $app_coordinates of application" -F Green  
}else{
    write-host "No red color found at Pixel '$app_coordinates' of application" -F Yellow  
}
# output detected color for reference
$color