When you stretch you have a black, mid and white point.
My understanding is you never touch the white slider but only move the middle slider towards the curve.
When you have done this you can at the end move the black slider to just before the curve starts. Leave a little nose on the edge of the curve.
If you push the slider to far you start losing the darker parts of the image and it can look fake as the background disappears to black. This is my understanding of black clipping.
By the way lovely images and heaps of details.
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