Users of Xiaomi and Redmi smartphones often face a situation where factory color reproduction seems unnatural or too cold. Standard settings in the menu may not give the desired result, especially if you are used to quality matrixes of other brands or are engaged in photo processing.
Fortunately, the MIUI shell and its current version of HyperOS provide access to advanced engineering tools, which allow you to adjust image parameters at a level close to professional monitors. The process does not require root rights, but requires attention and understanding how your model’s color profile works.
In this article, we will discuss all available methods, from simple settings in the menu to the use of the engineering code cit. You will learn to remove yellowness, adjust color temperature and eliminate defects that interfere with the comfortable use of the smartphone. Proper calibration will not only improve the visual experience, but can also positively affect the autonomy of the device.
Preparation for screen calibration
Before you make changes to the system settings of the display, you need to prepare the device. Calibration is a delicate process that requires certain conditions. If you start adjusting colors when you turn on "Vision Protection" or automatic brightness, the result will be unpredictable and incorrect.
First of all, make sure that the battery is at least 50% charged. Although the setup process does not consume much power, a sudden shutdown while working with engineering codes can lead to resets or errors in the system, it is also recommended to turn off all background tasks and close applications.
☑️ Preparation of the Xiaomi smartphone
It's important to understand the difference between software correction and hardware defects, and if you see obvious spots, broken pixels, or strong edge lights on your screen, software calibration won't help, and in such cases, you need to diagnose the matrix or replace the display module.
⚠️ Warning: Before starting, take screenshots of the current screen settings, which will allow you to quickly return all parameters to the original state if the calibration result does not suit you.
Standard Color Translation Settings in MIUI
Most users will have enough options hidden in the standard settings menu. Xiaomi shell offers several preset profiles that change the nature of the picture. To access them, go to Settings → Screen → Colors and saturation.
Here you'll find a switch between Classic and Saturated. Classic makes the colors paler but as close to sRGB as possible, which is useful for document viewing. Saturated stretches the color gamut to make the picture brighter but less accurate.
You can also use a color temperature slider, and by moving it, you can make the image warmer (yellow) or cooler (blue), which is a basic tool that helps you compensate for the individual color perceptions of your eye.
- 🎨 Saturated: Ideal for gaming and watching videos, as it makes the picture juicy.
- 📄 Classic: The best choice for text and photography where accuracy is important.
- 🌡️ Temperature: allows you to manually adjust the shade of white without changing the saturation.
It's worth noting that these settings only affect the software interpretation of the image, that they don't change the physical properties of the matrix, but they can significantly improve the subjective quality of the image, and these tools are often not enough to deeply calibrate the image.
Using the CIT Engineering Menu for Tests
For more advanced setup and diagnostics, the CIT (Customer Integration Test) is a hidden part of the system, designed to test equipment in the factory, accessed through a special code in the Phone application.
Dial the code.
##6484####4636##MIUI Debug
Activity Launcher
From the CIT menu, select the item associated with the display (usually called "Display", "Screen" or "Color"). Here you can test for broken pixels, uniformity of backlights and gradients. These tests help to identify hardware problems that can not be fixed software.
| Test at CIT | Description | What to pay attention to |
|---|---|---|
| Color Test | Consistent change of colour | Presence of broken pixels |
| Gradient | Smooth transition of shades | Posterization (stepping) |
| Touch Test | Touchscreen check | Screen dead zones |
It's safe to use the engineering menu if you don't change the values in the voltage or refresh rate sections, and the main goal here is diagnostics, and if the tests are good but you don't like the colors, then the problem is the display settings, not the hardware.
Manual calibration through hidden parameters
The most powerful tool for enthusiasts is manual adjustment of parameters through hidden engineering codes or special applications. Some Xiaomi models have the code ##778##, which opens the PDM (Product Debug Mode) menu, and you can find sections responsible for gamut and white balance.
Within the PDM menu, you often find White Balance and Gamma, and you can change them to almost perfect color reproduction, but be careful: the values here are set in digital format, and incorrect input can lead to an unreadable screen.
What to do if the screen has turned purple?
For those who are afraid to go deep into the settings, there are Google Play apps like Screen Balance or Color Calibrator that create a color filter over the image that compensates for the matrix flaws. This is not a real panel calibration, but the visual effect can be very similar.
- 📱 Filters: secure and reversible, do not require root rights.
- ⚙️ Engineering codes: give access to real matrix parameters.
- 🔧 Root rights: allow you to change system calibration files (for advanced ones).
⚠️ Warning: Do not change the values in the engineering menu unless you know exactly what each parameter is responsible for. Incorrect settings can lead to image artifacts or the inability to read information from the screen.
Update frequency and permission setting
The quality of the picture depends not only on colors, but also on the smoothness of movement. Modern Xiaomi smartphones are equipped with screens with refresh rates of 90 Hz, 120 Hz and even 144 Hz. The correct setting of this parameter affects the perception of contrast and clarity of fonts.
Go to Settings → Screen → Update Frequency. You can choose "Default" (automatic system selection) or "High" (constant maximum operation). To calibrate visual perception, you better set the maximum frequency to see all artifacts.
Also worth paying attention to is the screen resolution: In models with adaptive resolution (e.g. 1.5K or 2K), the system can reduce it to save energy. To assess the quality of the picture, force the maximum resolution to be set in the developer settings or in the display menu.
💡
Maximum refresh rate and resolution give the clearest picture, but increase battery consumption. Automation is optimal for everyday use.
If you notice that when the brightness is low, the screen starts to flicker (PWM), this is a feature of OLED-matrixes. You can't remove this software, but you can use the function "anti-PWM" (if available in your model) or third-party applications that darken the screen with a software filter.
Resolving Common Display Problems
Even after calibration, specific problems may remain, such as yellow spots on the edges of the screen (called the "rainbow effect") often found on the screen. AMOLED-It's a hardware feature that's hard to fix software.
Another common problem is that it's greenish or pink on a white background at a minimum brightness, which is called "low brightness mura," and in some cases, it helps to turn on the Dark Theme mode throughout the system, which reduces eye strain and masks defects.
If calibration doesn’t help to remove the yellowness, try resetting your screen settings. Go to Settings → Advanced Settings → Recovery and Reset → Reset your Wi-Fi, mobile network and Bluetooth settings (sometimes a full reset helps, but this is an extreme measure). Also check for system updates, as Xiaomi often releases patches that improve the display.
- 🟡 Yellow edges: feature OLED, Often manifested at brightness up to 30%.
- 🟢 Green: may indicate degradation of the matrix or factory defect.
- 🌑 Low brightness: check if the energy saving mode is on.
In conclusion, the perfect calibration is a balance between the technical capabilities of the matrix and personal comfort. Don't aim for absolute color accuracy if the screen cuts your eye, but the main thing is to make it comfortable to use the device in all lighting conditions.
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Use Read Mode in your screen settings to read text comfortably, and it automatically turns the background into shades of gray, reducing eye strain and saving battery life.