This might be a repeat of a previous topic, but I didn't see one in the search I did on the forum here.

I was made aware of an issue with my Orion G16 Color camera (Touptek ATR3CMOS16000KPA) where a 12 bit image stored in a 16 bit FITS file would not be scaled properly. That is, the 12 bits per pixel would only occupy the first 4096 brightness values and never go above that (16 bits have about 65,000 values). The way the ASCOM driver does it is scale each pixel value by multiplying it by 16 (in PixInisght this is equivalent to using the pixelmath expression $T * 16.0), and both N.I.N.A. and APT have now added a pixel scaling feature that gives native scaled 16-bit FITS files:
APT - aptforum.com/phpbb/viewtopic.php?t=5354
NINA - nighttime-imaging.eu/docs/master/site/tabs/options/equipment/
Before Scaling:

After Scaling:


I don't know if it's possible to scale images out of camera through INDI, or if this is an INDI touptek driver issue, but being able to have scaled 16 bit FITS files like you have with ZWO or QHY cameras would be a blessing to say the least. This truncation causes issues with stacking particularly dark frames, as you get extreme truncation and a loss of data due to a lack of decimal places available for normalization.

Thank you all very much for your time,

S

This was discussed before and there is policy of not touching the data beyond what is necessary. Scaling can be performed in post-processing.