There are a few ways to remove one color in Photoshop. One way is to use the Select Color tool. With this tool, you can click on the color you want to remove to select it. Then, you can press the Delete key to remove the selected color. Another way to remove one color is to use the Replace Color tool.
With this tool, you can click on the color you want to remove and then choose a replacement color. The third way to remove one color is to use the Hue/Saturation tool. With this tool, you can adjust the hue, saturation, and lightness of a color. To remove one color, you would adjust the hue until the color you want to remove is no longer visible. You can also use this tool to change the saturation and lightness of a color.
Removing one color from an image in Photoshop is easy to do with the right tools. With the Select Color, Replace Color, or Hue/Saturation tools, you can quickly and easily remove any unwanted colors from your image.