Help converting these IM commands to Magick.NET

[Kroko]

Hello, I am a new user of ImageMagick and Magick.Net.
A lot of people recommand me to use IM and Magick.Net to perform image operations.

My goal is to remove Greenscreen from images. So I found IM script on Internet that gave me a basis but I don't manage to convert it to Magick.net.

I hope somebody could help me.

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magick convert greenscreen.jpg -alpha set ( +clone -blur 0x5 -colorspace Lab -channel R -evaluate set 50%% +channel -colorspace sRGB +dither -colors 30 -fuzz 15%% -fill None -draw "alpha 0,0 replace" -channel A -negate +channel ) -compose copyopacity -composite -filter Gaussian -resize 10%% -define filter:sigma=8.9 -resize 1000%% -alpha off gb_1.png

I have convert it to this but it can't convert this part

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+dither -colors 30 -fuzz 15%% -fill None -draw "alpha 0,0 replace"

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Dim greenscreen As New ImageMagick.MagickImage(source)
            greenscreen.Alpha(ImageMagick.AlphaOption.On)

            Using clone As ImageMagick.MagickImage = greenscreen.Clone
                clone.Blur(0, 5)
                clone.ColorSpace = ImageMagick.ColorSpace.Lab
                clone.Evaluate(ImageMagick.Channels.Red, ImageMagick.EvaluateOperator.Set, New ImageMagick.Percentage(50))
                clone.ColorSpace = ImageMagick.ColorSpace.sRGB

                '+dither
                '-colors 30
                '-fuzz 15%%
                '-fill None
                '-draw "alpha 0,0 replace"

                Dim settings As New ImageMagick.QuantizeSettings()
                settings.Colors = 30
                settings.DitherMethod = ImageMagick.DitherMethod.No
                clone.Quantize(settings)
                clone.ColorFuzz = New ImageMagick.Percentage(15)

                Dim FC As New ImageMagick.DrawableFillColor(Color.Transparent)
                clone.Draw(FC)
                Dim DA As New ImageMagick.DrawableAlpha(0, 0, ImageMagick.PaintMethod.Replace)
                clone.Draw(DA)

                clone.Negate(ImageMagick.Channels.Alpha)                

                '-compose copyopacity -composite
                '
                greenscreen.Composite(clone, ImageMagick.CompositeOperator.Copy)
            End Using
            greenscreen.Resize(New ImageMagick.Percentage(10))
            greenscreen.GaussianBlur(8, 9)
            greenscreen.Resize(New ImageMagick.Percentage(1000))
            greenscreen.Alpha(ImageMagick.AlphaOption.Off)

Thanks for any help.

[dlemstra]

Those commands would translate to this:

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// +dither -colors 30
image.Quantize(new QuantizeSettings()
{
  DitherMethod = DitherMethod.No,
  Colors = 30
});
// -fuzz 15%%
image.ColorFuzz = (Percentage)15;
// -fill None
image.Settings.FillColor = MagickColors.None;
// -draw "alpha 0,0 replace"
image.Draw(new DrawableAlpha(0, 0, PaintMethod.Replace));