// White circle paint = new SKPaint
W, H = 847, 847 # Create an empty BGR image (3 channels) img = np.zeros((H, W, 3), dtype=np.uint8)
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 847 create an image full
# 2️⃣ Allocate full canvas (filled with transparent black) canvas = Image.new(MODE, (WIDTH, HEIGHT), (0, 0, 0, 0))
int W = 847, H = 847; using var bitmap = new SKBitmap(W, H, true); using var canvas = new SKCanvas(bitmap); // White circle paint = new SKPaint W,
# 1️⃣ Define size and mode WIDTH, HEIGHT = 847, 847 MODE = "RGBA" # 4‑bytes per pixel
# 5️⃣ Save (auto‑compresses to PNG) canvas.save("full_image_847.png", format="PNG") print("✅ Image saved as full_image_847.png") : 847 × 847 × 4 B ≈ 2.7 MB – well under typical desktop limits. If you bump the size to 10 000 × 10 000 , memory jumps to 381 MB ; consider tiling (see Section 6). 5.2 Python – OpenCV (NumPy) import cv2 import numpy as np All examples create a full‑size image of 847
// 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;