The Readout Option window in the 'Edit' pull down menu is just another way of doing the same thing.

You can change the way these values are reported by hitting the indicated arrow on the status bar, which brings up a further menu: When you run the cursor over an image, the pixel values are reported on the status bar at the bottom of the PixInsight app: I don't know which parts of this you do or do not understand so apologies if I now explain things you already know. The main concern here is that I am using their script WeightedBatchPreprocessing to post-process my raws. However, I have used the 'FlatContourPlot' script, and the 'HistogramTransformation' process and they show low histogram counts. The other option is that maybe I am using incorrectly their tools. Now on the Pixinsight, version, I have the Core Version 1.8.8-12 Ripley (ењ†4). I tend to agree with you that probably RawDigger would be the correct one, as it is a product focused on that type of analysis, so I assume that their histogram would be correct. Newer versions of PixInsight use LibRaw instead of DCRaw and this fixes the problem. DCRaw had a known bug with some Sony cameras (including the A7S) which resulted in values being one quarter of what they should be, so you are seeing peaks of 2000 out of 4096. I think you are using an out-of-date version of PixInsight which uses DCRaw to read the raw files.

Rawdigger rapper