How to turn a line into a gradient

Quick answer：

To turn a line into a gradient, you can use various graphic design software or programming libraries that support gradient effects. In graphic design software like Adobe Photoshop or Illustrator, you can create a gradient by selecting the gradient tool and adjusting the gradient colors and direction on the line. In programming, libraries like Python's PIL (Pillow) or HTML/CSS can be used to apply gradients to a line. The technique involves defining the gradient colors and applying them along the length of the line, either horizontally, vertically, or along a custom path.