So are all histograms similar? I use DigiCamControl with my 5300 and use that histogram.
No all histograms are not similar. The back of camera (BoC) histogram is the histogram of the JPG file that the camera calculates internally (whether or not JPG is written to the memory card). It is therefore the histogram of white-balanced gamma-stretched non-linear data and is similar to the histogram you would see in Photoshop when you open the raw file which again is non-linear.
But if you open the raw file in PixInsight then the histogram you see is the histogram of raw data linear values because the white-balancing and colour space gamma has not been applied - this is probably true of most astro-processing applications. The histogram will therefore look completely different to the BoC histogram.
I'm not familiar with DigiCamControl so I don't know which histogram it will display but most DSLR acquisition software will display the BoC histogram or something very similar. If you compare it to the BoC histogram then you will soon know for certain.
It's potentially confusing but it's always important to know exactly what kind of histogram you are looking at.
Edited by sharkmelley, 21 November 2019 - 07:32 AM.