With the caveat that I'm using StellarMate, not Astroberry, I certainly never see a 256-bit histogram. In the camera tab on the INDI Control Panel, is there an option for 8-bit vs. 16-bit images? For a long time my Pi kept defaulting to 8-bit and my images suffered terribly because of that! Dunno how the CR2 and FITS work together but the FITS off my ASI183, a 14-bit camera, are always 16-bit.

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