How is this mode different from Color mode and Normal B&W mode? We performed some experiments to find out.

Normal B&W simply changes a basic color photograph to black and white.
Although this does create a different impression, High Contrast B&W intensifies the contrast and creates a grainy image, thereby achieving an even fresher effect. The enhanced gradation of the sky, in particular, gives the photo more impact.

*Color and Normal B&W use color bracketing.