Which tool would you use to create a smooth transition in color?

The Gradient tool is specifically designed to create smooth transitions between colors. This tool allows users to blend multiple colors seamlessly, creating a gradient effect that can be adjusted in terms of direction, type, and color stops. This functionality is essential for achieving a gradual blending effect, such as transitioning from one color to another or fading a color into transparency.

In contrast, other tools like the Clone Stamp tool are used for duplicating areas of an image, which does not facilitate color transitions. The Brush tool, while versatile for painting and applying color, does not inherently create gradients without additional techniques. Lastly, the Path tool is utilized for creating and manipulating vector shapes and paths, not for color transitions. Thus, the Gradient tool is the most suitable choice for creating smooth color transitions.