Why does the photo suddenly become darker when I manually adjust the brightness in the Xiaomi 15 Ultra Gallery?

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The reasons for becoming darker of the brightness are listed below:
1. The brightness adjustment function in Xiaomi Gallery involves real-time algorithm processing. When you try to adjust the brightness, the system calculates the real-time results of the adjustment, and the photo will be temporarily darkened;
2. Xiaomi Gallery has automatic optimization enabled, which can automatically adjust the brightness, contrast, color, etc. of the photo. If the system detects that the image itself is already very bright or saturated, it will apply an automatic processing process to avoid overexposure.