847 Create An Image Full

# Draw a white circle cv2.circle(img, (W//2, H//2), W//4, (255,255,255), thickness=5)

# Fill with gradient (BGR order) for y in range(H): img[y, :, 0] = int(255 * (y / H)) # Blue channel img[y, :, 1] = 128 # Green channel img[y, :, 2] = int(255 * (1 - y / H)) # Red channel 847 create an image full

// 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; # Draw a white circle cv2

const W = 847; const H = 847; const canvas = createCanvas(W, H); const ctx = canvas.getContext('2d'); # Draw a white circle cv2.circle(img