W, H = 847, 847 # Create an empty BGR image (3 channels) img = np.zeros((H, W, 3), dtype=np.uint8)
# 1️⃣ Define size and mode WIDTH, HEIGHT = 847, 847 MODE = "RGBA" # 4‑bytes per pixel
# 2️⃣ Allocate full canvas (filled with transparent black) canvas = Image.new(MODE, (WIDTH, HEIGHT), (0, 0, 0, 0)) 847 create an image full
// Full‑image gradient var paint = new SKPaint
# 4️⃣ Add a centered circle center = (WIDTH // 2, HEIGHT // 2) radius = WIDTH // 4 draw.ellipse([center[0]-radius, center[1]-radius, center[0]+radius, center[1]+radius], outline=(255, 255, 255, 255), width=5) W, H = 847, 847 # Create an
# Draw a white circle cv2.circle(img, (W//2, H//2), W//4, (255,255,255), thickness=5)
// Write to PNG const out = fs.createWriteStream('node_canvas_full_847.png'); const stream = canvas.createPNGStream(); stream.pipe(out); out.on('finish', () => console.log('✅ Canvas image saved')); – node-canvas uses cairo under the hood; ensure your host has sufficient shared memory ( /dev/shm ) if you scale to > 10 k px. 5.4 C# – SkiaSharp (Cross‑Platform) using SkiaSharp; using System.IO; H = 847
Style = SKPaintStyle.Stroke, Color = SKColors.White, StrokeWidth = 5 ; canvas.DrawCircle(W / 2f, H / 2f, W / 4f, paint);
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