function processImage(originalImg, intensity = 50) {
const canvas = document.createElement('canvas');
const ctx = canvas.getContext('2d');
canvas.width = originalImg.width;
canvas.height = originalImg.height;
// Parse intensity to a valid number between 0 and 100
let intVal = parseFloat(intensity);
if (isNaN(intVal)) intVal = 50;
const factor = Math.max(0, Math.min(100, intVal)) / 100;
// "Red Book" (Xiaohongshu) popular aesthetic filter characteristics:
// 1. Higher brightness / exposure
// 2. Softer contrast for a clean, creamy look
// 3. Increased saturation for vibrant colors
// 4. A slight warm, reddish/pinkish tint (achieved via sepia + negative hue-rotate)
const brightness = 1 + (0.15 * factor);
const contrast = 1 - (0.10 * factor);
const saturate = 1 + (0.30 * factor);
const sepia = 0.25 * factor;
const hueRotate = -15 * factor;
// Apply the standard canvas filter
ctx.filter = `brightness(${brightness}) contrast(${contrast}) saturate(${saturate}) sepia(${sepia}) hue-rotate(${hueRotate}deg)`;
ctx.drawImage(originalImg, 0, 0);
return canvas;
}The Red Book Image Filter Tool applies a popular social media aesthetic to your photos, characterized by increased brightness, vibrant color saturation, and a soft, warm tint. By adjusting the intensity, users can achieve a clean and creamy look suitable for lifestyle photography. This tool is ideal for content creators looking to quickly enhance their images for social media platforms like Xiaohongshu.