Images with glowing ends

[robertkjr3d]

And again:
I only have a foggy idea of how to duplicate creating foot_t.png with Magick.NET... The tools don't seem to have the same functionality, or enough options.

How would I do this part? Even without the triangulation.
%IM%convert ^
%SRC% ^
( +clone -crop 50x50+100+100 +repage -scale 1x1 +write txt: +delete ) ^

ImageMagick.MagickImage c = image.Clone();
ImageMagick.MagickGeometry mg = new ImageMagick.MagickGeometry(100, 100, 50, 50);
c.Crop(mg);
c.RePage();
c.Scale(1, 1);
c.Write ?? At which point this begins to not make sense.