Trimming Image Borders using ImageMagick.Net Produces thin border in Trimmed Image

Question

I'm trimming the extra green borders space around the following image

But after trimming i get small white borders around the image using Image Magick.net

var mfactory = new MagickFactory();
            Bitmap bit;
            using (var image = new MagickImage(mfactory.Image.Create(bmp)))
            {
                // Trimming WhiteSpace
                image.Trim();
                bit = image.ToBitmap();
            }

Image with green borders