I want to fill the black area in the figure below with an image. How can I do it? If not, can I fill it with color

[jueqing1015]

I want to fill the black area around the figure above with an image. If it cannot be filled with an image, can I fill it with white,

[dlemstra]

This might now work for every image but you could do something like this:

using (var image = new MagickImage("input.jpg"))
{
    // Add a border on all sides of the image to make it possible to fill the image.
    image.Extent(image.Width + 2, image.Height + 2, Gravity.Center, MagickColors.Black);

    // Fill the black border pixels with a transparent color.
    image.ColorFuzz = new Percentage(10);
    image.FloodFill(MagickColors.Transparent, 0, 0);

    // Trim the image to remove the border that was added.
    image.Trim();

    // Load background image, use your own background instead of the sample below
    using (var background = new MagickImage("plasma:", image.Width, image.Height))
    {
        // Draw background under the image.
        image.Composite(background, CompositeOperator.DstAtop);
    }

    image.Write("output.jpg");
}

[jueqing1015]

Not at present. I just want to remove the black edge by mask

[dlemstra]

If you have an image and a mask I can explain you what to do. But you will need to manually create a mask for every type of image.

[jueqing1015]

https://github.com/dlemstra/Magick.NET/files/7229170/4.zip
Could you please explain it with the image inside

[dlemstra]

You don't have a mask in those files. There is no method to just create the mask, you will need to do that manually.

[jueqing1015]

DanBloomberg/leptonica#590
I use another control to achieve the desired effect, but now I want to go to magic.net. Now I have done some of the steps. Please help me see. I'm one step away now

MagickImage image = new MagickImage("c:\0025.jpg");
image.Threshold(new Percentage(50));
MagickImage mask = new MagickImage(image.Clone());
MagickImage newmask = new MagickImage(mask.Clone());
mask.Threshold(new Percentage(70));
mask.BorderColor = MagickColors.Black;
mask.Border(1);

        mask.ColorFuzz = new Percentage(10);
        mask.FloodFill(MagickColors.White, 0, 0);
        newmask.Composite(mask, CompositeOperator.DstAtop);
        image.Composite(newmask, CompositeOperator.CopyAlpha);
        MagickImage images = new MagickImage(MagickColors.White, image.Width, image.Height);
        image.Composite(mask, CompositeOperator.DstAtop);