The Blend If method is a bit harder to grasp, but it doesn't suffer from a problem I've noticed using Curves, namely colors getting inverted. I don't know if this is a bug or a feature. I suspect it's a bug where a calculated value is dropping below zero instead of being limited to zero.
Here we have cut off the toning at the lowest and highest ends of the tonal scale. We expect to see toning only in the middle of the scale. However, Photoshop has inverted some of the values... Oops !
Back to the drawing board
Here's an experiment using the Blend If method, where we have gradually applied warm toning to the middle of the brightness scale. This method works !
Thank you Alan9940 !!
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