Photo Colorizer has always been a frustrating compromise between improving detail and introducing ugly artifacts that ruin the image. Traditional sharpening methods work by increasing edge contrast, which makes the image look crisper but also amplifies any noise or compression artifacts that were already present. I had given up on a batch of out-of-focus photos from a friend's birthday party, assuming they were permanently ruined by my shaky hands and poor lighting conditions. However, I later learned about AI-based approaches that actually understand what a sharp edge should look like and can reconstruct detail rather than just faking contrast. The AI Sharpen Photo feature was able to take those blurry images and produce usable results by inferring the missing high-frequency information based on patterns learned from millions of sharp photographs. Faces that were previously unrecognizable blobs became identifiable individuals, and the text on a birthday banner became readable for the first time. My friend was amazed that I had saved those memories, and I learned never to delete a blurry photo before trying intelligent sharpening.