To adjust the color of a photo, you can use photo editing software like Adobe Photoshop, GIMP, or even mobile apps like Snapseed. Here are some general steps: 1. Open the photo in your chosen software. 2. Look for the 'Adjustments' or 'Color Correction' menu. 3. Use tools like 'Brightness', 'Contrast', 'Saturation', and 'Hue' to tweak the colors. 4. You can also use specific color adjustment layers or sliders for more precise control. 5. Save your changes.