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RGB curving all channels

I used CurveMeister, because it is quicker/better etc., but this adjustment could have equally be done using the standard Curves dialog.

The final curves were...

When I curve in RGB, I adjust the individual channels before changing the Master RGB one.

Initially I set the Shadow and Highlight points - the shadow is just left of the main stairs and the highlight is the white post under the main tower.

You get much more control using all the channels, but it is more complex and not always easy to do in RGB (compared to Lab)