The image on the left is not significantly processed, just converted from raw to jpeg. The image on the right has had quite a bit of work. Click the images to enlarge and observe the details mentioned below.
As the image was imported from RAW format I used lens correction. Once in photoshop I used a perspective crop to ‘straighten’ the bridge piers and background buildings (Keystone correction). This was followed by adjusting the highlights and shadows so that the underside of the bridge contained some detail. A few sensor spots were ‘healed’ using that brush. Next the image was sharpened. I then slightly increased the saturation for the blue areas of the shot using colour select. Finally I used a noise reduction filter.
The question is then – does the image benefit from the processing or should it be viewed as the camera took it?