adv7510 RGB quantization range

can anyone explain how RGB qunatization range control bits work in adv7510?

according to adv7510 programming guide, addr 0x57 bits[3:2] control RGB quantization range, it can be set to enable either limited range or full range, with flat RGB input I measured adv7510 output pixel RGB values while changing bits[3:2] values and expect to see output pixel RGB value to change, however it didn't. can anyone help? thanks.

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