Found this solution from
here
[Reflection.Assembly]::LoadWithPartialName("System.Drawing")
function screenshot([Drawing.Rectangle]$bounds, $path) {
$bmp = New-Object Drawing.Bitmap $bounds.width, $bounds.height
$graphics = [Drawing.Graphics]::FromImage($bmp)
$graphics.CopyFromScreen($bounds.Location, [Drawing.Point]::Empty, $bounds.size)
$bmp.Save($path)
$graphics.Dispose()
$bmp.Dispose()
}
$bounds = [Drawing.Rectangle]::FromLTRB(0, 0, 6000, 900)
screenshot $bounds "C:\Users\harwoodm\Desktop\testing.png"
Just change the last two numbers in $bounds to change the size of the capture.
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