03-12-2020, 08:10 AM
Plenty of ways. If your dial has black markings on a white background(*), you can use a paint tool in "Lighten only" mode. Since it paints only if it makes the pixels lighter, and that any color is lighter than black but darker than white, it only applies color to the markings.
For other suggestions, please attach your image, each image has its own problems.
(*) If necessary you can use "Colors>Brightness contrast" to make the dark parts darker and the light parts lighter.
For other suggestions, please attach your image, each image has its own problems.
(*) If necessary you can use "Colors>Brightness contrast" to make the dark parts darker and the light parts lighter.