My private Advanced Creative Photography class met this morning for their second field trip. Applying the Zone System with color was a bit harder becuase we do not tend to see tonal value as we look at a colored object. The use of a color zone chart helped them to see how hues can changed based on the light. In the shadows, hues are darker but in the bright sunlight, they can be much lighter. Comparing tonal values is also helpful when a photographer wants to convert a color image to B&W. Too many hues with the same tonal value results in a flat B&W image.