[问题求助] [已解决]PowerShell怎样给图片左右两边加上蓝色？

Add-Type -AssemblyName System.Drawing
function Cover-Image {
    param(
        [string]$ImagePath,
#        [int]$TopCover,
#        [int]$BottomCover,
[int]$leftAdd,
[int]$rightAdd,
[Drawing.Color]$colorAdd
    )
    $originalImage = [System.Drawing.Image]::FromFile($ImagePath)
    $originalHeight = $originalImage.Height
    $originalWidth = $originalImage.Width
#    $graphics = [System.Drawing.Graphics]::FromImage($originalImage)
#    $whiteBrush = New-Object System.Drawing.SolidBrush([System.Drawing.Color]::White)
#    $graphics.FillRectangle($whiteBrush, 0, 0, $originalWidth, $TopCover)
#    $graphics.FillRectangle($whiteBrush, 0, $originalHeight - $BottomCover, $originalWidth, $BottomCover)
#    $coveredImagePath = [System.IO.Path]::ChangeExtension($ImagePath, "covered.jpg")
#    $originalImage.Save($coveredImagePath, [System.Drawing.Imaging.ImageFormat]::Jpeg)

$new_image=[System.Drawing.bitmap]::new($originalWidth+$leftAdd+$rightAdd,$originalHeight,[drawing.imaging.PixelFormat]::Format32bppArgb)
$img_brush=New-Object System.Drawing.SolidBrush($colorAdd)
$img_canvas=[System.Drawing.Graphics]::FromImage($new_image)
$img_canvas.FillRectangle($img_brush,0,0,$new_image.width,$new_image.height)
$img_canvas.DrawImage($originalImage,$leftAdd,0)
$new_path = [System.IO.Path]::ChangeExtension($ImagePath, "covered.jpg")
$new_image.Save($new_path, [System.Drawing.Imaging.ImageFormat]::Jpeg)
}

# 白色覆盖顶部100像素，底部150像素
#$topCover = 100
#$bottomCover = 150

# 用MidnightBlue色，左边添加100像素，右边150像素
$left_add = 100
$right_add=150
$color_add=[System.Drawing.Color]::MidnightBlue

dir *.jpg | ForEach-Object {
#    Cover-Image -ImagePath $_.FullName -TopCover $topCover -BottomCover $bottomCover
Cover-Image -ImagePath $_.FullName -leftAdd $left_add -rightAdd $right_add -colorAdd $color_add
    }
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$new_image.SetResolution($originalImage.HorizontalResolution,$originalImage.VerticalResolution)
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