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// convert shirt.jpg
using (var shirt = new MagickImage("shirt.jpg"))
{
    // -modulate 100,100,33.3
    shirt.Modulate(new Percentage(100), new Percentage(100), new Percentage(33.3));

    // -colorspace HSL
    shirt.ColorSpace = ColorSpace.HSL;

    // -channel Hue,Saturation -separate +channel
    using (MagickImageCollection images = new MagickImageCollection(shirt.Separate(Channels.Red | Channels.Green)))
    {
        // No need to clone because we can work on the original images.
        // -delete 0,1 deletes them

        // -background none
        images[0].BackgroundColor = MagickColors.None;

        // -fuzz 5%
        images[0].ColorFuzz = new Percentage(5);

        // +transparent grey64
        images[0].InverseTransparent(new MagickColor("grey64"));

        // -background none
        images[1].BackgroundColor = MagickColors.None;

        // -fuzz 10%
        images[1].ColorFuzz = new Percentage(10);

        // -transparent black
        images[1].Transparent(new MagickColor("black"));

        // -alpha extract
        images[0].Alpha(AlphaOption.Extract);
        images[1].Alpha(AlphaOption.Extract);

        // -compose multiply - composite
        images[0].Composite(images[1], CompositeOperator.Multiply);

        clone0.Write("shirt_mask.png");
    }
}