are black white and gray is special colors without tunes

Black, white, and gray are indeed special colors in various systems and contexts:

1. RGB Model: In the RGB color model, black is represented as (0, 0, 0), white as (255, 255, 255), and gray as any value that has equal amounts of R, G, and B (e.g., (128, 128, 128)). They are the extremes and neutral tones.

2. Grayscale: These three colors also represent different levels in a grayscale image. Black is the darkest, white is the lightest, and grays fall in between based on their brightness.

3. CMYK Model: In printing, black ink is often used on its own, rather than mixing cyan, yellow, and magenta to achieve a black color. This streamlines printing and reduces costs.

4. Psychological associations: White象征纯洁，黑代表黑暗邪恶，灰则给人以中性、忧郁的感觉。这些联系因文化而异。

5. Fashion: 白色和黑色被视为“基本色”或经典色，适合搭配任何其他颜色的服装饰品。灰色同样很受欢迎，因其低调而典雅。

6. Design: 在设计领域，黑白色灰色经常用来作为背景色或中性色，能和其他鲜艳色彩协调搭配，并保持视觉平衡。

However, saying they "have no hues" would be more accurate. Hues refer to the actual color we perceive (e.g., red, blue, yellow), while shades and tints are variations of those colors based on lightness/darkness or adding white, respectively. Black, white, and gray do not have a specific hue of their own. They are considered neutral or achromatic colors that exist outside the hue spectrum. But they still play very important special roles in many fields.