: Choose your new solid color (e.g., "100% Black") in the Replace with color picker.

If you are using an older version or prefer a guided process, use the standard Replace dialog.

When you replace a dark color, it turns into a lifeless gray mud. Fix: Before replacing, increase the Saturation of the source color using the HSL tool. You cannot add saturation to grey. Alternatively, use the Color Balance tool ( Adjustments > Color Balance ) to inject hues into the shadows or midtones.

in the "Original" area to click the color in your image you wish to change. Define the New Color Eyedropper