Upon awakening the sky was very cloudy and the Matterhorn was completely covered. In 20 minutes the clouds have thinned and opened the passages through which the sunlight passed. Therefore this photo is a late dawn and it's a double exposure. The post-production, contrary to what it may seem, in this case was pretty low: the light was really incredible. I point out the cloning of some disturbing elements in the lower part of the photo.
Canon 400D, Sigma 17-70mm f/2.8-4.5 DC HSM, 1/160sec, ISO100, f/8