There were actually many details captured by the sensor, one would need to process it and pull out the devils in the post production. Do look at the images below:
Ansel Adams 拍摄黑白照时，他会“预览”previsualize，即是要获得一张曝光”準确的底片，以便在后期中能更有效的把影调呈现出来，从而研发了Zone System的方法。同样在数码摄影的世界里也能“预览”，而且比拍摄菲林的时代更为容易。我的方法是，不让亮的地方过曝。如果对比真的太强烈，那幺就再曝光多一张，后期即可以合併起来。
Ansel Adams pre-visualizes before making an exposure, to ensure he got a “well exposed" negative, and thus the Zone System was born. In the digital world, previsualization is only easier. I would normally make sure I didn’t over exposed the sky, and when the contrast is too high, I would make another exposure on the shadows.
所以，为何不后期製作？And so, why NOT post-processed?