How to crop a square picture to a circle, how to achieve in the code

[d4ilys]

Hello~
How to crop a square picture to a circle, how to achieve in the code
The effect is as follows:

[dlemstra]

This is probably not the only option but you could do something like this:

using var image = new MagickImage("plasma:purple", 300, 300);

using var mask = new MagickImage(MagickColors.Black, 300, 300);
mask.Draw(
    new DrawableFillColor(MagickColors.White),
    new DrawableCircle(100, 100, 100, 1)
);
mask.Alpha(AlphaOption.Copy);

image.Composite(mask, CompositeOperator.CopyAlpha);
image.Write("circle.jpg");