I've made a photo in Entangle, and then opened it in RawTherapee. When comparing the histograms, I noticed that they are very different. See the screenshot:
Here we can see a deep dip in G and B channels but almost no lack of dark piixels in RawTherapee, with very mild dip in Entangle and a considerable lack of dark pixels.
What could be a reason for this? Does one (or both) of the programs show histogram of somehow post-processed image? How do I see the real histogram of the RAW image?