j4nu wrote:
2613pch wrote
“Zebras … show the actual RAW DR latitude.”
Usually they do not. Zebras are generally calculated from the camera’s processed preview or video signal, just like the histogram. They can become a good proxy for raw clipping after testing and calibration, but they are not inherently a direct measurement of raw photosite values. Their relationship to raw clipping can change with picture profile, white balance, ISO, gamma, and zebra threshold.
Metering determines the camera’s exposure recommendation.
The JPEG histogram and zebras estimate what the processed image is doing.
Raw clipping is what determines whether recoverable sensor data has actually been lost. Not sure what you intended to convey here, but my point was that zebras are good enough to protect highlights from clipping (if zebra level lower limit is properly set), which in turn maximizes captured DR.
I understand your point better now, and I agree that properly calibrated zebras can be good enough in practice to protect important highlights from raw clipping. My objection was only to the wording that zebras show the “actual RAW DR latitude,” since they normally derive their warning from a processed signal rather than directly displaying raw-channel values.
So I think we largely agree on the practical method. My qualification is simply that calibrated zebras are a very good proxy for raw clipping—not a literal display of the raw data itself.