# Draw a white circle cv2.circle(img, (W//2, H//2), W//4, (255,255,255), thickness=5)
// White circle paint = new SKPaint
// Full‑image gradient var paint = new SKPaint 847 create an image full
int W = 847, H = 847; using var bitmap = new SKBitmap(W, H, true); using var canvas = new SKCanvas(bitmap); # Draw a white circle cv2