I expect we were discussing the histogram you see before you take a photo.How can you "back off exposure in each channel after quantization" when the analog amplification, which is the only way to increase the SNR in the shadows, must occur before quantization? Once you do ADC, the SNR is locked in. Any adjustments to signal are also made to noise.
My (also half baked) thought was: the camera could evaluate a raw data feed to establish max exposure, and back off by adjusting exposure time when you press the shutter release. In AE modes, the shutter release triggers metering. Same thing here. Whatever you’ve set, back off enough to not clip the brightest channel. If nothing has clipped, no change.
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