The Color Shift
Modern iPhones feature a specialized hardware component called the ambient light sensor. Apple utilizes this sensor to power a feature called “True Tone.” When enabled, the iPhone actively monitors the color temperature of the lighting in your physical environment. If you are sitting in a room with warm, yellow incandescent bulbs, the iPhone will artificially shift the entire display to look slightly yellow. If you step outside into bright, cool sunlight, the screen will shift to a colder blue. While this makes reading text slightly easier on the eyes, it completely ruins color accuracy. If you are editing photographs, watching a movie, or shopping for clothes online, you must disable True Tone to see the actual, intended colors on your screen.
How to Turn Off True Tone
You can force the display to maintain a static, accurate color profile via the Display settings.
- Open the Settings app on your iPhone.
- Scroll down and tap on Display & Brightness.
- Look for the section labeled “Brightness.”
- Directly underneath the brightness slider, you will see a toggle switch labeled True Tone.
- Toggle this switch to the Off position (the green background will disappear).
Absolute Color Accuracy
The change takes effect instantly. You will likely immediately notice the screen shift back to a crisp, neutral white. The iPhone has completely severed the software link to the ambient light sensor. As you move between different rooms and lighting environments, the display will maintain absolute color accuracy, ensuring that the photographs and videos you edit on your phone look exactly the same when viewed on other devices.