Recognition effect remains unchanged after image quality improvement

Hello
I have a photo containing multiple faces, some of which are not clear, and then I used some tools to fix it. The size of the image has increased from 12MB to 40MB, but the face recognition effect is almost the same as before.". I wonder why?

The issue names no files, tests, or entry points. Start by reproducing recognition on the original and enhanced images, recording the inputs and outputs; trace the recognition pipeline to determine whether the reported behavior is expected. Done means a reproducible diagnosis with a documented fix or explanation.

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