You know those crisp, beautiful autumn mornings with azure skies and a low-angled sun jabbing fingers of light through the trees into a carpet of mist? It was one of those. I took photos in my local park while walking the dog. Each scene, viewed by eye, was a perfect English autumn composition. The resulting photos? Rubbish! Each image was underexposed, the rays of sunlight looked weak and the sky was a flat pastel.