How to Calibrate the Screen on Xiaomi Redmi Note 9 Pro

Modern smartphones, such as Xiaomi Redmi Note 9 Pro, are equipped with high-quality IPS-High-resolution panels, but factory color profile settings do not always satisfy demanding users. Owners often notice that the white color goes into cold blue or, conversely, has an unpleasant yellowish tint, which distorts the perception of content when viewing a photo or video. The screen calibration allows you to bring the color range in accordance with personal preferences and color reproduction standards, making the image more natural.

The process of adjusting the display on the shell of MIUI does not require obtaining superuser rights or flashing the device, since the system offers quite flexible built-in tools. Competent settings of brightness, contrast and color temperature can significantly extend the comfortable time of use of the gadget and reduce eye strain. In this guide, we will discuss in detail all available methods for image correction, from standard settings to hidden engineering menus.

Now, the ideal calibration is a subjective concept, depending on the lighting conditions and the individual vision, some prefer warm tones to read books in the dark, others need maximum saturation to work with graphics, and we'll look at the options for different use cases, so you can find the perfect balance between energy efficiency and picture quality.

Basic Color Profile Setting in MIUI

The first and safest step to improving image quality is to work with the standard system settings, which are hidden in the display menu. The MIUI shell provides several preset color schemes, each of which changes the saturation and temperature of colors according to a specific algorithm. To access these parameters, you need to go to Settings → Screen → Color Scheme, where the user is asked to choose one of the modes of operation of the matrix.

Saturated Colors is a popular choice for games and video, but it doesn't work for accurate color reproduction because it distorts the real shades of objects. Standard mode, in turn, tries to bring the colors closer to the sRGB reference space, making the image paler but realistic.

⚠️ Warning: A sudden change in color scheme from "saturated" to "standard" can cause temporary eye discomfort as the brain is used to the oversaturated picture.

If you don't like any of the preset profiles, it allows you to go to User mode, and you can have saturation and temperature sliders, and you can move the temperature slider to the left, you add blues, and to the right, heat and yellows, and that's the main tool for eliminating the factory blockage in one of the color channels.

Using Reading Mode to Calibrate Shades

Special attention should be paid to the function Reading Mode, which was originally created to reduce the load on the eyes when working with text, but can be effectively used to fine-tune the screen. Unlike the simple blue light filter, this mode in the Redmi Note 9 Pro can mimic the texture of paper and change the color temperature depending on the time of day. → Screen. → Reading mode.

In the advanced settings of this mode, Adaptive Color Temperature is available, which automatically adjusts the white balance to the ambient lighting. This may be useful if you change locations often, but for static calibration, it is better to use manual sliders. You can set up individual profiles for applications so that, for example, the screen is warm in the browser and cold in the gallery.

• 📱 Classic Mode: Adds a light yellow filter, keeping the text readable and the interface's basic color rendering.
• 📖 Paper mode: Includes a special noise algorithm that simulates electronic ink, which radically changes the perception of the image.
• 🌙 Night mode: Reduces the blue component of the spectrum as much as possible, making the screen very warm, which is ideal for use in complete darkness.

Using these settings not only calibrates the screen for a specific task, but also saves battery life significantly, as warmer colors require less backlight energy in certain scenarios. Experiment with the level of dimming and temperature to find a combination in which the white background in the documents stops cutting your eyes.

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To quickly check the white balance, open a pure white image on the full screen and compare it to a sheet of white paper in daylight.The screen should not explicitly go into pink or green shades.

Engineering menu and hidden display settings

For advanced users who don’t have enough standard tools, the engineering menu is accessed through a special code, which allows you to get to the deeper level of the matrix settings, including gamma and individual color channels correction. To enter the engineering menu, open the Phone app and type the combination ##64663## or ##3646633##, which will open the hidden test interface of CIT.

In the test menu, you need to find a section associated with the display (often called Display or LCD), where you can test for broken pixels, check the uniformity of the backlight and, in some versions of the firmware, change the color temperature parameters in more detail, but be extremely careful: changing unknown parameters can lead to incorrect display of the interface.

The path to the screen test: CIT Menu → Display → Color Temperature Test

If the standard code doesn't open the full engineering menu, you can use the Activity Launcher app available in the Play Market, which allows you to run hidden activities of the system. Find the activity of com.android.settings.CIT or just EngineerMode on the list, which gives you access to the same functions as the secret code, but through a graphical interface.

Importantly, on global firmware versions, access to some of the engineering menu features may be limited to developers, in which case deep calibration is only possible through a computer and ADB debugging, which requires a PC and certain skills.

Elimination of yellowness and the “butterfly” effect

One of the common problems with IPS-matrixes in Xiaomi smartphones is the so-called “butterfly effect” or uneven backlighting, when the edges of the screen glow brighter than the center or have a yellowish edge. Completely remove this defect is impossible software, since this is a physical feature of the build and the panel itself, but you can visually smooth out the differences.

If your screen has a noticeable yellowness around the edges, try in user mode (Settings → Screen → Color Scheme → Custom) to slightly cool the image by shifting the temperature slider to the left. This will not remove the spots completely, but will make the transitions less noticeable to the human eye. Also helps to reduce the overall brightness, since at 100% brightness, backlight defects are visible most strongly.

There is a myth that burning the screen (prolonged display of white at maximum brightness) helps to align the backlight. On modern LCD/IPS matrices, this method is ineffective and can only accelerate the degradation of crystals and backlight burnout, so it is not recommended to use it.

Calibration through third-party apps and ADB

If built-in tools are not enough, Google Play applications like Screen Balance or Color Calibrator come to the rescue, creating a filter layer over the image that allows you to fine-tune the balance of red, green and blue channels (RGB). They don’t need root rights to work, as they use standard root rights. API Android for overlaying.

The principle of these applications is to invert colors: if the screen goes green, the application applies a purple filter, which allows you to achieve almost perfect gray on a white background, but this method has a significant disadvantage - loss of brightness and possible impact on the autonomy of the device, because the processor must constantly process the video stream.

For users familiar with the command line, calibration via ADB (Android Debug Bridge) is available, and by connecting the phone to a computer, you can change the system configuration files of the display. For example, a command to change the pixel density (DPI) can visually change the scale and clarity of fonts, which subjectively improves the perception of the picture:

adb shell wm density 440

You can also force the developer mode to be enabled through ADB to manage animations in more detail, making the interface visually smoother and more responsive, creating the illusion of a better screen. But beware: changing system settings through ADB requires accuracy, one error in the team's syntax can cause the interface to crash.

⚠️ Note: When using filter apps, make sure they don't have excessive permissions to access your data.Trust only trusted, high-ranking developers in the app store.

FAQ: Frequently Asked Questions on Calibration

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Optimal calibration is a balance between color accuracy and eye comfort achieved by selecting a user profile, rather than blindly following technical standards.