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Huh! Now I really don't

Huh! Now I really don't understand - you said that my proposed change caused problem with the per channel black level calibration. Or in other words that the margins that were used by 0.19 and below caused a problem.

I am trying to understand WHY it causes a problem - if you calculate the per channel calibration on the image area (i.e. without the frame), surely it will be correct.

If you are saying the someone else is using LibRaw and is using the full frame area for astronomical image processing calibration frames then they are doing it wrong! And if they persuaded you to make this change to the margins, then you should revert it immediately.


David Partridge