How to adjust gradient color to monochrome

Quick answer：

To adjust a gradient color to monochrome, you need to select a single color to represent the gradient. This can be done by choosing a specific hue, saturation, and brightness level that you want to apply throughout the gradient range. In image editing software like Photoshop, you can use the 'Gradient Map' tool to achieve this. You would first create a gradient map with the desired monochrome color as the sole color in the map, then apply it to your image.