The human eye is drawn to bright colors, and there are times when that can actually take away from the power of the picture.
Another good time to change to B&W is if the color in the scene is distracting or simply not pleasing. The human eye is drawn to bright colors, and there are times when that can actually take away from the power of the picture. I’ll aways remember when the newspaper I was working for at the time switched to color. The editors stopped looking for the best photo from an assignment, and instead would look for the most colorful. I guess they wanted to get their money’s worth from the more expensive production process. The photo staff would joke that we should carry a rock painted bright blue and put it in every picture.