The Art of Photography, 2nd Edition

Figure 7-1: Mt. Samson and Peaks of the Canadian RockiesWith sunlight coming in through the hazy sky from the right, the polarizer helped separate the tonalities of the sky from those of the clouds by darkening the blue sky, which exhibits polarized light. It had little effect on the lower portions of the scene. The deep yellow filter further separated the tones of the sky and clouds without darkening the forested lower slopes. A #25 red filter would have created even greater cloud/sky separations but could have blacked out the trees. Thus the yellow filter was a better choice. Yet when I made the print, I dodged the forest throughout the basic ...