# 2️⃣ Allocate full canvas (filled with transparent black) canvas = Image.new(MODE, (WIDTH, HEIGHT), (0, 0, 0, 0))
# 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) 847 create an image full
const W = 847; const H = 847; const canvas = createCanvas(W, H); const ctx = canvas.getContext('2d'); # 2️⃣ Allocate full canvas (filled with transparent
// Centered white circle ctx.strokeStyle = '#FFF'; ctx.lineWidth = 5; ctx.beginPath(); ctx.arc(W/2, H/2, W/4, 0, Math.PI * 2); ctx.stroke(); All examples create a full‑size image of 847
If you anticipate images larger than 20 000 × 20 000 px , prefer libraries that expose direct memory mapping (e.g., OpenCV, SkiaSharp) and support streaming/tiled rendering . 5. Step‑by‑Step Workflow Below are concrete recipes for the most common environments. All examples create a full‑size image of 847 × 847 px (the number you supplied) and then fill it with a gradient background, draw a shape, and write it to disk. Why 847 × 847? It demonstrates a non‑power‑of‑two dimension, which can expose alignment bugs that often trigger error 847. 5.1 Python – Pillow from PIL import Image, ImageDraw
int W = 847, H = 847; using var bitmap = new SKBitmap(W, H, true); using var canvas = new SKCanvas(bitmap);
# Draw a white circle cv2.circle(img, (W//2, H//2), W//4, (255,255,255), thickness=5)