如何在.NET Core中使用MagickImage向图像添加填充

Question

I'm trying to write a function that adds padding to an image but I'm not sure on how to do that with ImageMagick.

    public bool AddPadding(string filePath)
    {
        // Read from file
        using (MagickImage image = new MagickImage(filePath))
        {
            int imageSize;
            int imageX = image.Width;
            int imageY = image.Height;

            if(imageX > imageY)
            {
                imageSize = imageX;
            }
            else
            {
                imageSize = imageY;
            }

            MagickGeometry size = new MagickGeometry(imageSize, imageSize);
            // Probably do more stuff here?




            // Save the result
            image.Write(filePath);
        }
    }

What do I need to add so that the image is centered and whitespace is added to both left and right?

Answer 1

You can use the Extent method of MagickImage for this. Below is an example of how you could do that.

public bool AddPadding(string filePath)
{
    // Read from file
    using (MagickImage image = new MagickImage(filePath))
    {
        int imageSize = Math.Max(image.Width, image.Height);

        // Add padding
        image.Extent(imageSize, imageSize, Gravity.Center, MagickColors.Purple);

        // Save the result
        image.Write(filePath);
    }
}

This adds a purple padding so you might want to change the color to a different one instead.