Blue Tone

Quick answer：

A blue tone refers to the use of shades of blue in art, photography, design, and other visual media. It often evokes feelings of calmness, serenity, and depth. In art, blue tones can be used to convey a wide range of emotions and moods. In photography, the presence of blue tones can influence the overall mood of a picture. Designers use blue tones to create a sense of harmony and balance.