Typical today raw converter (e.g. Adobe's and/or in-camera JPEG generator, I'm not familiar with rawtherapee) applies S-shaped curve (with different parameters for different cameras/different ISO setting on same camera/different other setting e.g. DLO on Nikon cameras).
LibRaw/dcraw default rendering does histogram shift to the right only.
Typical today raw converter (e.g. Adobe's and/or in-camera JPEG generator, I'm not familiar with rawtherapee) applies S-shaped curve (with different parameters for different cameras/different ISO setting on same camera/different other setting e.g. DLO on Nikon cameras).
LibRaw/dcraw default rendering does histogram shift to the right only.
Here is your sample with +1 correction with highlights compression: https://www.dropbox.com/s/fsimdf5alou55qy/Screenshot%202019-01-25%2020.2...